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Securities Available For Sale, Major Categories (Details) (USD $)
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Mar. 31, 2012
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Dec. 31, 2011
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | $ 221,575,000,000 | $ 215,571,000,000 |
| Gross unrealized gains | 10,655,000,000 | 10,211,000,000 |
| Gross unrealized losses | (1,964,000,000) | (3,169,000,000) |
| Securities available for sale | 230,266,000,000 | 222,613,000,000 |
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Debt Securities [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 218,840,000,000 | 212,642,000,000 |
| Gross unrealized gains | 10,193,000,000 | 9,660,000,000 |
| Gross unrealized losses | (1,920,000,000) | (3,106,000,000) |
| Securities available for sale | 227,113,000,000 | 219,196,000,000 |
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US Treasury and Government [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 4,642,000,000 | 6,920,000,000 |
| Gross unrealized gains | 43,000,000 | 59,000,000 |
| Gross unrealized losses | (7,000,000) | (11,000,000) |
| Securities available for sale | 4,678,000,000 | 6,968,000,000 |
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US States and Political Subdivisions [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 33,809,000,000 | 32,307,000,000 |
| Gross unrealized gains | 915,000,000 | 1,169,000,000 |
| Gross unrealized losses | (487,000,000) | (883,000,000) |
| Securities available for sale | 34,237,000,000 | 32,593,000,000 |
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Mortgage Backed Securities [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 132,658,000,000 | 127,105,000,000 |
| Gross unrealized gains | 7,379,000,000 | 6,987,000,000 |
| Gross unrealized losses | (886,000,000) | (1,352,000,000) |
| Securities available for sale | 139,151,000,000 | 132,740,000,000 |
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Federal agencies [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 98,409,000,000 | 92,279,000,000 |
| Gross unrealized gains | 4,293,000,000 | 4,485,000,000 |
| Gross unrealized losses | (37,000,000) | (10,000,000) |
| Securities available for sale | 102,665,000,000 | 96,754,000,000 |
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Residential [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 16,491,000,000 | 16,997,000,000 |
| Gross unrealized gains | 1,582,000,000 | 1,253,000,000 |
| Gross unrealized losses | (244,000,000) | (414,000,000) |
| Securities available for sale | 17,829,000,000 | 17,836,000,000 |
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Commercial [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 17,758,000,000 | 17,829,000,000 |
| Gross unrealized gains | 1,504,000,000 | 1,249,000,000 |
| Gross unrealized losses | (605,000,000) | (928,000,000) |
| Securities available for sale | 18,657,000,000 | 18,150,000,000 |
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Corporate debt securities [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 19,274,000,000 | 17,921,000,000 |
| Gross unrealized gains | 1,034,000,000 | 769,000,000 |
| Gross unrealized losses | (135,000,000) | (286,000,000) |
| Securities available for sale | 20,173,000,000 | 18,404,000,000 |
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Collateralized debt obligations [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 9,031,000,000 | 8,650,000,000 |
| Gross unrealized gains | 366,000,000 | 298,000,000 |
| Gross unrealized losses | (234,000,000) | (349,000,000) |
| Securities available for sale | 9,163,000,000 | 8,599,000,000 |
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Other Debt Securities [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 19,426,000,000 | 19,739,000,000 |
| Gross unrealized gains | 456,000,000 | 378,000,000 |
| Gross unrealized losses | (171,000,000) | (225,000,000) |
| Securities available for sale | 19,711,000,000 | 19,892,000,000 |
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Equity Securities [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 2,735,000,000 | 2,929,000,000 |
| Gross unrealized gains | 462,000,000 | 551,000,000 |
| Gross unrealized losses | (44,000,000) | (63,000,000) |
| Securities available for sale | 3,153,000,000 | 3,417,000,000 |
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Perpetual preferred securities [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 2,224,000,000 | 2,396,000,000 |
| Gross unrealized gains | 224,000,000 | 185,000,000 |
| Gross unrealized losses | (43,000,000) | (54,000,000) |
| Securities available for sale | 2,405,000,000 | 2,527,000,000 |
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Other equity securities [Member]
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| Schedule of Available-for-sale Securities [Line Items] | ||
| Cost | 511,000,000 | 533,000,000 |
| Gross unrealized gains | 238,000,000 | 366,000,000 |
| Gross unrealized losses | (1,000,000) | (9,000,000) |
| Securities available for sale | $ 748,000,000 | $ 890,000,000 |