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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 | 1,819,575 | 1,868,934 | ||||
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Asset And Liability Management Activities [Member]
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| Segment Reporting Information [Line Items] | ||||||
| Assets | 611,793 | 641,494 | ||||
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Equity Investment Income [Member]
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| Segment Reporting Information [Line Items] | ||||||
| Assets | 7,002 | 34,272 | ||||
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Liquidating Businesses [Member]
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| Segment Reporting Information [Line Items] | ||||||
| Assets | 29,741 | 43,291 | ||||
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Intersegment Elimination [Member]
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| Segment Reporting Information [Line Items] | ||||||
| Assets | (495,439) | (460,107) | ||||
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Other Adjustment [Member]
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| Segment Reporting Information [Line Items] | ||||||
| Assets | $ 156,374 | $ 137,025 | ||||
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