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Fair Values (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Investment securities: |  |
Equity securities | $ 371 | $ 360
Debt securities and other | 6,308 | 6,787
Derivatives | 1,070 | 1,516
Total assets | 7,749 | 8,663
Level 1 [Member] |  |
Investment securities: |  |
Equity securities | 371 | 360
Debt securities and other | 338 | 340
Derivatives | 0 | 0
Total assets | 709 | 700
Level 2 [Member] |  |
Investment securities: |  |
Equity securities | 0 | 0
Debt securities and other | 5,970 | 6,447
Derivatives | 1,070 | 1,516
Total assets | 7,040 | 7,963
Level 3 [Member] |  |
Investment securities: |  |
Total assets | $ 0 | $ 0

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