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Business Segment Information - Consolidated Assets (Details) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2012
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Dec. 31, 2011
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| Segment Reporting Information [Line Items] | ||||||
| Assets | $ 2,209,974 | [1] | $ 2,129,046 | [1] | ||
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Operating Segments [Member]
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| Segment Reporting Information [Line Items] | ||||||
| Assets | 1,962,690 | 1,808,555 | ||||
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Asset And Liability Management Activities [Member]
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| Segment Reporting Information [Line Items] | ||||||
| Assets | 622,722 | 611,793 | ||||
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Equity Investment Income [Member]
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| Segment Reporting Information [Line Items] | ||||||
| Assets | 5,508 | 7,098 | ||||
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Liquidating Businesses [Member]
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| Segment Reporting Information [Line Items] | ||||||
| Assets | 32,597 | 37,570 | ||||
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Intersegment Elimination [Member]
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| Segment Reporting Information [Line Items] | ||||||
| Assets | (554,426) | (492,251) | ||||
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Other Adjustment [Member]
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| Segment Reporting Information [Line Items] | ||||||
| Assets | $ 140,883 | $ 156,281 | ||||
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