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Business Segment Information - Consolidated Assets (Details) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2011
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Dec. 31, 2010
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| Segment Reporting Information [Line Items] | ||||||
| Assets | $ 2,129,046 | [1] | $ 2,264,909 | [1] | ||
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Operating Segments [Member]
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| Segment Reporting Information [Line Items] | ||||||
| Assets | 1,948,611 | 2,054,652 | ||||
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Asset And Liability Management Activities [Member]
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| Segment Reporting Information [Line Items] | ||||||
| Assets | 647,569 | 601,307 | ||||
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Equity Investment Income [Member]
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| Segment Reporting Information [Line Items] | ||||||
| Assets | 6,923 | 34,185 | ||||
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Liquidating Businesses [Member]
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| Segment Reporting Information [Line Items] | ||||||
| Assets | 29,746 | 43,288 | ||||
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Intersegment Elimination [Member]
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| Segment Reporting Information [Line Items] | ||||||
| Assets | (531,702) | (476,471) | ||||
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Other Adjustment [Member]
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| Segment Reporting Information [Line Items] | ||||||
| Assets | $ 27,899 | $ 7,948 | ||||
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