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Securities Available for Sale, Unrealized Loss Position, by Credit Rating (Details) (USD $)
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Mar. 31, 2012
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Dec. 31, 2011
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
$ (1,964,000,000) |
$ (3,169,000,000) |
| Fair value |
230,266,000,000 |
222,613,000,000 |
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Investment Grade [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(1,017,000,000) |
(1,859,000,000) |
| Fair value |
34,485,000,000 |
45,405,000,000 |
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Non-investment Grade [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(946,000,000) |
(1,301,000,000) |
| Fair value |
6,207,000,000 |
8,147,000,000 |
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Debt Securities [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(1,920,000,000) |
(3,106,000,000) |
| Fair value |
227,113,000,000 |
219,196,000,000 |
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Debt Securities [Member] | Investment Grade [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(976,000,000) |
(1,806,000,000) |
| Fair value |
33,720,000,000 |
44,572,000,000 |
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Debt Securities [Member] | Non-investment Grade [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(944,000,000) |
(1,300,000,000) |
| Fair value |
6,193,000,000 |
8,134,000,000 |
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US Treasury and Government [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(7,000,000) |
(11,000,000) |
| Fair value |
4,678,000,000 |
6,968,000,000 |
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US Treasury and Government [Member] | Investment Grade [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(7,000,000) |
(11,000,000) |
| Fair value |
3,562,000,000 |
5,473,000,000 |
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US Treasury and Government [Member] | Non-investment Grade [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
0 |
0 |
| Fair value |
0 |
0 |
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US States and Political Subdivisions [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(487,000,000) |
(883,000,000) |
| Fair value |
34,237,000,000 |
32,593,000,000 |
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US States and Political Subdivisions [Member] | Investment Grade [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(410,000,000) |
(781,000,000) |
| Fair value |
6,614,000,000 |
12,093,000,000 |
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US States and Political Subdivisions [Member] | Non-investment Grade [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(77,000,000) |
(102,000,000) |
| Fair value |
517,000,000 |
756,000,000 |
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Mortgage Backed Securities [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(886,000,000) |
(1,352,000,000) |
| Fair value |
139,151,000,000 |
132,740,000,000 |
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Mortgage Backed Securities [Member] | Investment Grade [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(275,000,000) |
(478,000,000) |
| Fair value |
15,357,000,000 |
11,795,000,000 |
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Mortgage Backed Securities [Member] | Non-investment Grade [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(611,000,000) |
(874,000,000) |
| Fair value |
4,573,000,000 |
5,591,000,000 |
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Federal agencies [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(37,000,000) |
(10,000,000) |
| Fair value |
102,665,000,000 |
96,754,000,000 |
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Federal agencies [Member] | Investment Grade [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(37,000,000) |
(10,000,000) |
| Fair value |
10,382,000,000 |
3,019,000,000 |
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Federal agencies [Member] | Non-investment Grade [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
0 |
0 |
| Fair value |
0 |
0 |
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Residential [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(244,000,000) |
(414,000,000) |
| Fair value |
17,829,000,000 |
17,836,000,000 |
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Residential [Member] | Investment Grade [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(7,000,000) |
(39,000,000) |
| Fair value |
963,000,000 |
2,503,000,000 |
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Residential [Member] | Non-investment Grade [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(237,000,000) |
(375,000,000) |
| Fair value |
3,573,000,000 |
4,717,000,000 |
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Commercial [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(605,000,000) |
(928,000,000) |
| Fair value |
18,657,000,000 |
18,150,000,000 |
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Commercial [Member] | Investment Grade [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(231,000,000) |
(429,000,000) |
| Fair value |
4,012,000,000 |
6,273,000,000 |
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Commercial [Member] | Non-investment Grade [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(374,000,000) |
(499,000,000) |
| Fair value |
1,000,000,000 |
874,000,000 |
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Corporate debt securities [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(135,000,000) |
(286,000,000) |
| Fair value |
20,173,000,000 |
18,404,000,000 |
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Corporate debt securities [Member] | Investment Grade [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(38,000,000) |
(165,000,000) |
| Fair value |
1,705,000,000 |
7,156,000,000 |
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Corporate debt securities [Member] | Non-investment Grade [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(97,000,000) |
(121,000,000) |
| Fair value |
694,000,000 |
1,118,000,000 |
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Collateralized debt obligations [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(234,000,000) |
(349,000,000) |
| Fair value |
9,163,000,000 |
8,599,000,000 |
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Collateralized debt obligations [Member] | Investment Grade [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(102,000,000) |
(185,000,000) |
| Fair value |
3,131,000,000 |
4,597,000,000 |
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Collateralized debt obligations [Member] | Non-investment Grade [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(132,000,000) |
(164,000,000) |
| Fair value |
262,000,000 |
284,000,000 |
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Other Debt Securities [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(171,000,000) |
(225,000,000) |
| Fair value |
19,711,000,000 |
19,892,000,000 |
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Other Debt Securities [Member] | Investment Grade [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(144,000,000) |
(186,000,000) |
| Fair value |
3,351,000,000 |
3,458,000,000 |
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Other Debt Securities [Member] | Non-investment Grade [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(27,000,000) |
(39,000,000) |
| Fair value |
147,000,000 |
385,000,000 |
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Equity Securities [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(44,000,000) |
(63,000,000) |
| Fair value |
3,153,000,000 |
3,417,000,000 |
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Perpetual preferred securities [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(43,000,000) |
(54,000,000) |
| Fair value |
2,405,000,000 |
2,527,000,000 |
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Perpetual preferred securities [Member] | Investment Grade [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(41,000,000) |
(53,000,000) |
| Fair value |
765,000,000 |
833,000,000 |
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Perpetual preferred securities [Member] | Non-investment Grade [Member]
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| Securities Available for Sale in an Unrealized Loss Position by Investment Grade [Abstract] |
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| Gross unrealized losses |
(2,000,000) |
(1,000,000) |
| Fair value |
$ 14,000,000 |
$ 13,000,000 |