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Securities - Amortized Cost, Gains and Losses, and Fair Value (Details) (USD $)
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12 Months Ended |
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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| Debt and Marketable Equity Securities [Abstract] |
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| Available-for-sale Securities, Amortized Cost |
$ 279,860,000,000
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$ 271,172,000,000
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| AFS Debt Securities |
286,906,000,000
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276,151,000,000
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| Held-to-maturity debt securities, Amortized Cost |
49,481,000,000
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35,265,000,000
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| Held-to-maturity Securities, Unrecognized Holding Gain |
815,000,000
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181,000,000
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| Held-to-maturity Securities, Unrecognized Holding Loss |
(26,000,000)
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(4,000,000)
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| Held-to-maturity Securities, Fair Value |
50,270,000,000
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35,442,000,000
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| Total Debt Securities Amortized Cost |
329,341,000,000
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306,437,000,000
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| Total Debt Securities Gross Unrealized Gains |
8,521,000,000
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6,843,000,000
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| Total Debt Securities Gross Unrealized Losses |
(686,000,000)
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(1,687,000,000)
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| Debt Securities, Fair Value |
337,176,000,000
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311,593,000,000
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| In Text Details [Abstract] |
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| Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax |
4,400,000,000
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| Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax |
2,600,000,000
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| Nonperforming Debt Securities |
91,000,000
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140,000,000
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| Gross gains recorded in OCI |
5,000,000
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9,000,000
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51,000,000
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United States Treasury And Agency Securities Member
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| Debt and Marketable Equity Securities [Abstract] |
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| Available-for-sale Securities, Amortized Cost |
24,232,000,000
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| AFS Debt Securities |
24,472,000,000
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United States Treasury Securities Exceeding Ten Percent Of Consolidated Shareholders Equity [Member]
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| Debt and Marketable Equity Securities [Abstract] |
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| Available-for-sale Securities, Amortized Cost |
24,232,000,000
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43,433,000,000
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| Available-for-sale Securities, Gross Unrealized Gains |
324,000,000
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242,000,000
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| Available-for-sale Securities, Gross Unrealized Losses |
(84,000,000)
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(811,000,000)
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| AFS Debt Securities |
24,472,000,000
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42,864,000,000
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Agency Securities [Member]
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| Debt and Marketable Equity Securities [Abstract] |
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| Available-for-sale Securities, Amortized Cost |
183,247,000,000
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138,073,000,000
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| Available-for-sale Securities, Gross Unrealized Gains |
5,048,000,000
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4,511,000,000
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| Available-for-sale Securities, Gross Unrealized Losses |
(146,000,000)
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(21,000,000)
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| AFS Debt Securities |
188,149,000,000
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142,563,000,000
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Collateralized Mortgage Obligations [Member]
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| Debt and Marketable Equity Securities [Abstract] |
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| Available-for-sale Securities, Amortized Cost |
36,329,000,000
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44,392,000,000
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| Available-for-sale Securities, Gross Unrealized Gains |
1,427,000,000
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774,000,000
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| Available-for-sale Securities, Gross Unrealized Losses |
(218,000,000)
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(167,000,000)
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| AFS Debt Securities |
37,538,000,000
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44,999,000,000
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Residential Mortgage Backed Securities [Member]
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| Debt and Marketable Equity Securities [Abstract] |
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| Available-for-sale Securities, Amortized Cost |
9,231,000,000
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[1] |
14,948,000,000
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[1] |
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| Available-for-sale Securities, Gross Unrealized Gains |
391,000,000
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[1] |
301,000,000
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[1] |
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| Available-for-sale Securities, Gross Unrealized Losses |
(128,000,000)
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[1] |
(482,000,000)
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[1] |
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| AFS Debt Securities |
9,494,000,000
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[1] |
14,767,000,000
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[1] |
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Residential Mortgage Backed Securities [Member] | Prime Loan [Member]
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| Table Details [Abstract] |
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| Available-for-sale Securities, Debt Maturities, Percent Held by Rating |
91.00%
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89.00%
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Residential Mortgage Backed Securities [Member] | Alt-A Loan [Member]
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| Table Details [Abstract] |
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| Available-for-sale Securities, Debt Maturities, Percent Held by Rating |
6.00%
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9.00%
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Residential Mortgage Backed Securities [Member] | Subprime Loan [Member]
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| Table Details [Abstract] |
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| Available-for-sale Securities, Debt Maturities, Percent Held by Rating |
3.00%
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2.00%
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Commercial Mortgage Backed Securities [Member]
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| Debt and Marketable Equity Securities [Abstract] |
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| Available-for-sale Securities, Amortized Cost |
3,576,000,000
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4,894,000,000
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| Available-for-sale Securities, Gross Unrealized Gains |
348,000,000
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629,000,000
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| Available-for-sale Securities, Gross Unrealized Losses |
0
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(1,000,000)
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| AFS Debt Securities |
3,924,000,000
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5,522,000,000
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Non United States Securities [Member]
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| Debt and Marketable Equity Securities [Abstract] |
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| Available-for-sale Securities, Amortized Cost |
5,574,000,000
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4,872,000,000
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| Available-for-sale Securities, Gross Unrealized Gains |
50,000,000
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62,000,000
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| Available-for-sale Securities, Gross Unrealized Losses |
(6,000,000)
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(14,000,000)
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| AFS Debt Securities |
5,618,000,000
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4,920,000,000
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Corporate Bond Securities [Member]
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| Debt and Marketable Equity Securities [Abstract] |
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| Available-for-sale Securities, Amortized Cost |
1,415,000,000
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2,993,000,000
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| Available-for-sale Securities, Gross Unrealized Gains |
51,000,000
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79,000,000
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| Available-for-sale Securities, Gross Unrealized Losses |
(16,000,000)
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(37,000,000)
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| AFS Debt Securities |
1,450,000,000
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3,035,000,000
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Other Debt Obligations [Member]
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| Debt and Marketable Equity Securities [Abstract] |
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| Available-for-sale Securities, Amortized Cost |
12,089,000,000
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12,889,000,000
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| Available-for-sale Securities, Gross Unrealized Gains |
54,000,000
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49,000,000
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| Available-for-sale Securities, Gross Unrealized Losses |
(15,000,000)
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(60,000,000)
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| AFS Debt Securities |
12,128,000,000
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12,878,000,000
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Taxable Securities [Member]
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| Debt and Marketable Equity Securities [Abstract] |
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| Available-for-sale Securities, Amortized Cost |
275,693,000,000
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266,494,000,000
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| Available-for-sale Securities, Gross Unrealized Gains |
7,693,000,000
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6,647,000,000
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| Available-for-sale Securities, Gross Unrealized Losses |
(613,000,000)
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(1,593,000,000)
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| AFS Debt Securities |
282,773,000,000
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271,548,000,000
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Tax-exempt securities [Member]
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| Debt and Marketable Equity Securities [Abstract] |
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| Available-for-sale Securities, Amortized Cost |
4,167,000,000
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4,678,000,000
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| Available-for-sale Securities, Gross Unrealized Gains |
13,000,000
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15,000,000
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| Available-for-sale Securities, Gross Unrealized Losses |
(47,000,000)
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(90,000,000)
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| AFS Debt Securities |
4,133,000,000
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4,603,000,000
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Debt [Member]
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| Debt and Marketable Equity Securities [Abstract] |
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| Available-for-sale Securities, Gross Unrealized Gains |
7,706,000,000
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6,662,000,000
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| Available-for-sale Securities, Gross Unrealized Losses |
(660,000,000)
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(1,683,000,000)
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| In Text Details [Abstract] |
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| Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax |
4,443,000,000
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3,100,000,000
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714,000,000
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(628,000,000)
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| Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax |
1,319,000,000
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2,594,000,000
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1,331,000,000
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Equity Securities
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| Debt and Marketable Equity Securities [Abstract] |
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| Available-for-sale Securities, Gross Unrealized Gains |
732,000,000
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[2] |
10,000,000
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[2] |
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| Available-for-sale Securities, Gross Unrealized Losses |
0
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[2] |
(7,000,000)
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[2] |
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| Available-for-sale Equity Securities, Amortized Cost Basis |
780,000,000
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[2] |
65,000,000
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[2] |
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| Available-for-sale Securities, Equity Securities |
1,512,000,000
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[2] |
68,000,000
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[2] |
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Common Stock [Member] | China Construction Bank [Member]
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| In Text Details [Abstract] |
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| Cost Method Investment, Cost Basis |
700,000,000
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700,000,000
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| Cost Method Investments, Fair Value Disclosure |
$ 1,400,000,000
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$ 1,400,000,000
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