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Securities Securities - Gross Unrealized Losses (Details) (USD $)
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Dec. 31, 2011
Securities
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Dec. 31, 2010
Securities
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| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
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| Less than Twelve Months, Fair Value |
$ 25,233,000,000
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[1] |
$ 128,960,000,000
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[1] |
| Less than Twelve Months, Gross Unrealized Losses |
(344,000,000)
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[1] |
(3,395,000,000)
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[1] |
| Twelve Months or Longer, Fair Value |
48,555,000,000
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[1] |
6,105,000,000
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[1] |
| Twelve Months or Longer, Gross Unrealized Losses |
(1,346,000,000)
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[1] |
(1,123,000,000)
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[1] |
| Total, Fair Value |
73,788,000,000
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[1] |
135,065,000,000
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[1] |
| Total, Gross Unrealized Losses |
(1,690,000,000)
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[1] |
(4,518,000,000)
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[1] |
| Table Details [Abstract] |
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| Number of Available for Sale Securities Amortized Cost Exceeds Fair Value |
3,800
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8,500
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| Available for Sale Securities Amortized Cost Exceeding Fair Value |
1,700,000,000
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4,500,000,000
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Temporarily Impaired [Member]
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| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
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| Less than Twelve Months, Fair Value |
25,075,000,000
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|
128,764,000,000
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| Less than Twelve Months, Gross Unrealized Losses |
(316,000,000)
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(3,376,000,000)
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| Twelve Months or Longer, Fair Value |
48,066,000,000
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|
5,352,000,000
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| Twelve Months or Longer, Gross Unrealized Losses |
(1,301,000,000)
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(568,000,000)
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| Total, Fair Value |
73,141,000,000
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|
134,116,000,000
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| Total, Gross Unrealized Losses |
(1,617,000,000)
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(3,944,000,000)
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Temporarily Impaired [Member] | United States Treasury And Agency Securities Member
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| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
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| Less than Twelve Months, Fair Value |
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27,384,000,000
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| Less than Twelve Months, Gross Unrealized Losses |
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(763,000,000)
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| Twelve Months or Longer, Fair Value |
38,269,000,000
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|
2,382,000,000
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| Twelve Months or Longer, Gross Unrealized Losses |
(811,000,000)
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(149,000,000)
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| Total, Fair Value |
38,269,000,000
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29,766,000,000
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| Total, Gross Unrealized Losses |
(811,000,000)
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(912,000,000)
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Temporarily Impaired [Member] | Debt Securities [Member]
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| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
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| Less than Twelve Months, Fair Value |
25,044,000,000
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|
128,757,000,000
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| Less than Twelve Months, Gross Unrealized Losses |
(315,000,000)
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(3,374,000,000)
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| Twelve Months or Longer, Fair Value |
48,060,000,000
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|
5,333,000,000
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| Twelve Months or Longer, Gross Unrealized Losses |
(1,295,000,000)
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(557,000,000)
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| Total, Fair Value |
73,104,000,000
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|
134,090,000,000
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| Total, Gross Unrealized Losses |
(1,610,000,000)
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(3,931,000,000)
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Temporarily Impaired [Member] | Agency Securities [Member]
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| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
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| Less than Twelve Months, Fair Value |
4,679,000,000
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|
85,517,000,000
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| Less than Twelve Months, Gross Unrealized Losses |
(13,000,000)
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|
(2,240,000,000)
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| Twelve Months or Longer, Fair Value |
474,000,000
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| Twelve Months or Longer, Gross Unrealized Losses |
(8,000,000)
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| Total, Fair Value |
5,153,000,000
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85,517,000,000
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| Total, Gross Unrealized Losses |
(21,000,000)
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(2,240,000,000)
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Temporarily Impaired [Member] | Collateralized Mortgage Obligations [Member]
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| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
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| Less than Twelve Months, Fair Value |
11,448,000,000
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|
3,220,000,000
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| Less than Twelve Months, Gross Unrealized Losses |
(134,000,000)
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(23,000,000)
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| Twelve Months or Longer, Fair Value |
976,000,000
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| Twelve Months or Longer, Gross Unrealized Losses |
(33,000,000)
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| Total, Fair Value |
12,424,000,000
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3,220,000,000
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| Total, Gross Unrealized Losses |
(167,000,000)
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(23,000,000)
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Temporarily Impaired [Member] | Residential Mortgage Backed Securities [Member]
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| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
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| Less than Twelve Months, Fair Value |
2,112,000,000
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6,385,000,000
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| Less than Twelve Months, Gross Unrealized Losses |
(59,000,000)
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(205,000,000)
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| Twelve Months or Longer, Fair Value |
3,950,000,000
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2,245,000,000
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| Twelve Months or Longer, Gross Unrealized Losses |
(350,000,000)
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(274,000,000)
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| Total, Fair Value |
6,062,000,000
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8,630,000,000
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| Total, Gross Unrealized Losses |
(409,000,000)
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(479,000,000)
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Temporarily Impaired [Member] | Commercial Mortgage Backed Securities [Member]
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| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
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| Less than Twelve Months, Fair Value |
55,000,000
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47,000,000
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| Less than Twelve Months, Gross Unrealized Losses |
(1,000,000)
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(1,000,000)
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| Total, Fair Value |
55,000,000
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47,000,000
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| Total, Gross Unrealized Losses |
(1,000,000)
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(1,000,000)
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Temporarily Impaired [Member] | Foreign Securities [Member]
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| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
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| Less than Twelve Months, Fair Value |
1,008,000,000
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| Less than Twelve Months, Gross Unrealized Losses |
(13,000,000)
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| Twelve Months or Longer, Fair Value |
165,000,000
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|
70,000,000
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| Twelve Months or Longer, Gross Unrealized Losses |
(1,000,000)
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(7,000,000)
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| Total, Fair Value |
1,173,000,000
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|
70,000,000
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| Total, Gross Unrealized Losses |
(14,000,000)
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(7,000,000)
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Temporarily Impaired [Member] | Corporate Bond Securities [Member]
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| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
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| Less than Twelve Months, Fair Value |
415,000,000
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|
465,000,000
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| Less than Twelve Months, Gross Unrealized Losses |
(29,000,000)
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(9,000,000)
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| Twelve Months or Longer, Fair Value |
111,000,000
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|
22,000,000
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| Twelve Months or Longer, Gross Unrealized Losses |
(8,000,000)
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(1,000,000)
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| Total, Fair Value |
526,000,000
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|
487,000,000
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| Total, Gross Unrealized Losses |
(37,000,000)
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(10,000,000)
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Temporarily Impaired [Member] | Other Debt Obligations [Member]
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| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
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| Less than Twelve Months, Fair Value |
4,210,000,000
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|
3,414,000,000
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| Less than Twelve Months, Gross Unrealized Losses |
(41,000,000)
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(38,000,000)
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| Twelve Months or Longer, Fair Value |
1,361,000,000
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|
46,000,000
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| Twelve Months or Longer, Gross Unrealized Losses |
(19,000,000)
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(7,000,000)
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| Total, Fair Value |
5,571,000,000
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3,460,000,000
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| Total, Gross Unrealized Losses |
(60,000,000)
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(45,000,000)
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Temporarily Impaired [Member] | Taxable Securities [Member]
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| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
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| Less than Twelve Months, Fair Value |
23,927,000,000
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126,432,000,000
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| Less than Twelve Months, Gross Unrealized Losses |
(290,000,000)
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(3,279,000,000)
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| Twelve Months or Longer, Fair Value |
45,306,000,000
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|
4,765,000,000
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| Twelve Months or Longer, Gross Unrealized Losses |
(1,230,000,000)
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(438,000,000)
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| Total, Fair Value |
69,233,000,000
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131,197,000,000
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| Total, Gross Unrealized Losses |
(1,520,000,000)
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(3,717,000,000)
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Temporarily Impaired [Member] | Tax-exempt securities [Member]
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| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
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| Less than Twelve Months, Fair Value |
1,117,000,000
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|
2,325,000,000
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| Less than Twelve Months, Gross Unrealized Losses |
(25,000,000)
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(95,000,000)
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| Twelve Months or Longer, Fair Value |
2,754,000,000
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|
568,000,000
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| Twelve Months or Longer, Gross Unrealized Losses |
(65,000,000)
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(119,000,000)
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| Total, Fair Value |
3,871,000,000
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2,893,000,000
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| Total, Gross Unrealized Losses |
(90,000,000)
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(214,000,000)
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Temporarily Impaired [Member] | Equity Securities
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| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
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| Less than Twelve Months, Fair Value |
31,000,000
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|
7,000,000
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| Less than Twelve Months, Gross Unrealized Losses |
(1,000,000)
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(2,000,000)
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| Twelve Months or Longer, Fair Value |
6,000,000
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|
19,000,000
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| Twelve Months or Longer, Gross Unrealized Losses |
(6,000,000)
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(11,000,000)
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| Total, Fair Value |
37,000,000
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26,000,000
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| Total, Gross Unrealized Losses |
(7,000,000)
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(13,000,000)
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Other Than Temporarily Impaired [Member] | Residential Mortgage Backed Securities [Member]
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| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
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| Less than Twelve Months, Fair Value |
158,000,000
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[2] |
128,000,000
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[2] |
| Less than Twelve Months, Gross Unrealized Losses |
28,000,000
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[2] |
(11,000,000)
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[2] |
| Twelve Months or Longer, Fair Value |
489,000,000
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[2] |
530,000,000
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[2] |
| Twelve Months or Longer, Gross Unrealized Losses |
45,000,000
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[2] |
(439,000,000)
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[2] |
| Total, Fair Value |
647,000,000
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[2] |
658,000,000
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[2] |
| Total, Gross Unrealized Losses |
73,000,000
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[2] |
(450,000,000)
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[2] |
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Other Than Temporarily Impaired [Member] | Other Debt Obligations [Member]
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| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
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| Twelve Months or Longer, Fair Value |
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|
223,000,000
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[2] |
| Twelve Months or Longer, Gross Unrealized Losses |
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(116,000,000)
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[2] |
| Total, Fair Value |
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|
223,000,000
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[2] |
| Total, Gross Unrealized Losses |
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(116,000,000)
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[2] |
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Other Than Temporarily Impaired [Member] | Tax-exempt securities [Member]
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| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
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| Less than Twelve Months, Fair Value |
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|
68,000,000
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[2] |
| Less than Twelve Months, Gross Unrealized Losses |
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(8,000,000)
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[2] |
| Total, Fair Value |
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|
68,000,000
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[2] |
| Total, Gross Unrealized Losses |
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$ (8,000,000)
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[2] |
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