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Securities - Gross Unrealized Losses (Details) (USD $)
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Jun. 30, 2012
Securities
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Dec. 31, 2011
Securities
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| Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |
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| Less than Twelve Months, Fair Value |
$ 26,662,000,000
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[1] |
$ 25,233,000,000
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[1] |
| Less than Twelve Months, Gross Unrealized Losses |
(247,000,000)
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[1] |
(344,000,000)
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[1] |
| Twelve Months or Longer, Fair Value |
34,555,000,000
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[1] |
48,555,000,000
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[1] |
| Twelve Months or Longer, Gross Unrealized Losses |
(787,000,000)
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[1] |
(1,346,000,000)
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[1] |
| Total, Fair Value |
61,217,000,000
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[1] |
73,788,000,000
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[1] |
| Total, Gross Unrealized Losses |
(1,034,000,000)
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[1] |
(1,690,000,000)
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[1] |
| Table Details [Abstract] |
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| Number of Available for Sale Securities Amortized Cost Exceeds Fair Value |
3,600
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3,800
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| Available for Sale Securities Amortized Cost Exceeding Fair Value |
1,000,000,000
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1,700,000,000
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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 |
26,619,000,000
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25,075,000,000
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| Less than Twelve Months, Gross Unrealized Losses |
(240,000,000)
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(316,000,000)
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| Twelve Months or Longer, Fair Value |
34,354,000,000
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|
48,066,000,000
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| Twelve Months or Longer, Gross Unrealized Losses |
(764,000,000)
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(1,301,000,000)
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| Total, Fair Value |
60,973,000,000
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73,141,000,000
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| Total, Gross Unrealized Losses |
(1,004,000,000)
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(1,617,000,000)
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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 |
26,616,000,000
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|
25,044,000,000
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| Less than Twelve Months, Gross Unrealized Losses |
(239,000,000)
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(315,000,000)
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| Twelve Months or Longer, Fair Value |
34,347,000,000
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|
48,060,000,000
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| Twelve Months or Longer, Gross Unrealized Losses |
(759,000,000)
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(1,295,000,000)
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| Total, Fair Value |
60,963,000,000
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73,104,000,000
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| Total, Gross Unrealized Losses |
(998,000,000)
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(1,610,000,000)
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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 |
25,783,000,000
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|
23,927,000,000
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| Less than Twelve Months, Gross Unrealized Losses |
(231,000,000)
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(290,000,000)
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| Twelve Months or Longer, Fair Value |
33,187,000,000
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45,306,000,000
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| Twelve Months or Longer, Gross Unrealized Losses |
(715,000,000)
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(1,230,000,000)
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| Total, Fair Value |
58,970,000,000
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69,233,000,000
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| Total, Gross Unrealized Losses |
(946,000,000)
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(1,520,000,000)
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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 |
254,000,000
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|
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| Less than Twelve Months, Gross Unrealized Losses |
(1,000,000)
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|
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| Twelve Months or Longer, Fair Value |
26,163,000,000
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|
38,269,000,000
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| Twelve Months or Longer, Gross Unrealized Losses |
(439,000,000)
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(811,000,000)
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| Total, Fair Value |
26,417,000,000
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38,269,000,000
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| Total, Gross Unrealized Losses |
(440,000,000)
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(811,000,000)
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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 |
11,060,000,000
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|
4,679,000,000
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| Less than Twelve Months, Gross Unrealized Losses |
(45,000,000)
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(13,000,000)
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| Twelve Months or Longer, Fair Value |
442,000,000
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|
474,000,000
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| Twelve Months or Longer, Gross Unrealized Losses |
(6,000,000)
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(8,000,000)
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| Total, Fair Value |
11,502,000,000
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5,153,000,000
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| Total, Gross Unrealized Losses |
(51,000,000)
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(21,000,000)
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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 |
7,748,000,000
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11,448,000,000
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| Less than Twelve Months, Gross Unrealized Losses |
(112,000,000)
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(134,000,000)
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| Twelve Months or Longer, Fair Value |
1,861,000,000
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|
976,000,000
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| Twelve Months or Longer, Gross Unrealized Losses |
(44,000,000)
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(33,000,000)
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| Total, Fair Value |
9,609,000,000
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12,424,000,000
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| Total, Gross Unrealized Losses |
(156,000,000)
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(167,000,000)
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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 |
1,581,000,000
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2,112,000,000
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| Less than Twelve Months, Gross Unrealized Losses |
(39,000,000)
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(59,000,000)
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| Twelve Months or Longer, Fair Value |
2,148,000,000
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3,950,000,000
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| Twelve Months or Longer, Gross Unrealized Losses |
(186,000,000)
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(350,000,000)
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| Total, Fair Value |
3,729,000,000
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6,062,000,000
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| Total, Gross Unrealized Losses |
(225,000,000)
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(409,000,000)
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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 |
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55,000,000
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| Less than Twelve Months, Gross Unrealized Losses |
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(1,000,000)
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| Total, Fair Value |
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|
55,000,000
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| Total, Gross Unrealized Losses |
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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 |
469,000,000
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|
1,008,000,000
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| Less than Twelve Months, Gross Unrealized Losses |
(3,000,000)
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(13,000,000)
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| Twelve Months or Longer, Fair Value |
657,000,000
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|
165,000,000
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| Twelve Months or Longer, Gross Unrealized Losses |
(5,000,000)
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(1,000,000)
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| Total, Fair Value |
1,126,000,000
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1,173,000,000
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| Total, Gross Unrealized Losses |
(8,000,000)
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(14,000,000)
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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 |
222,000,000
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|
415,000,000
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| Less than Twelve Months, Gross Unrealized Losses |
(17,000,000)
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(29,000,000)
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| Twelve Months or Longer, Fair Value |
103,000,000
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|
111,000,000
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| Twelve Months or Longer, Gross Unrealized Losses |
(9,000,000)
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(8,000,000)
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| Total, Fair Value |
325,000,000
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|
526,000,000
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| Total, Gross Unrealized Losses |
(26,000,000)
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(37,000,000)
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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 |
4,449,000,000
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4,210,000,000
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| Less than Twelve Months, Gross Unrealized Losses |
(14,000,000)
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(41,000,000)
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| Twelve Months or Longer, Fair Value |
1,813,000,000
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1,361,000,000
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| Twelve Months or Longer, Gross Unrealized Losses |
(26,000,000)
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(19,000,000)
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| Total, Fair Value |
6,262,000,000
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5,571,000,000
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| Total, Gross Unrealized Losses |
(40,000,000)
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(60,000,000)
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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 |
833,000,000
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|
1,117,000,000
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| Less than Twelve Months, Gross Unrealized Losses |
(8,000,000)
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(25,000,000)
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| Twelve Months or Longer, Fair Value |
1,160,000,000
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2,754,000,000
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| Twelve Months or Longer, Gross Unrealized Losses |
(44,000,000)
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(65,000,000)
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| Total, Fair Value |
1,993,000,000
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3,871,000,000
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| Total, Gross Unrealized Losses |
(52,000,000)
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(90,000,000)
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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 |
3,000,000
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|
31,000,000
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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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| Twelve Months or Longer, Fair Value |
7,000,000
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|
6,000,000
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| Twelve Months or Longer, Gross Unrealized Losses |
(5,000,000)
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(6,000,000)
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| Total, Fair Value |
10,000,000
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|
37,000,000
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| Total, Gross Unrealized Losses |
(6,000,000)
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(7,000,000)
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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 |
43,000,000
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[2] |
158,000,000
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[2] |
| Less than Twelve Months, Gross Unrealized Losses |
(7,000,000)
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[2] |
(28,000,000)
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[2] |
| Twelve Months or Longer, Fair Value |
201,000,000
|
[2] |
489,000,000
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[2] |
| Twelve Months or Longer, Gross Unrealized Losses |
(23,000,000)
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[2] |
(45,000,000)
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[2] |
| Total, Fair Value |
244,000,000
|
[2] |
647,000,000
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[2] |
| Total, Gross Unrealized Losses |
$ (30,000,000)
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[2] |
$ (73,000,000)
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[2] |
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