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Fair Values (Details) (USD $) In Millions | Sep. 30, 2011 | Dec. 31, 2010
--- | --- | ---
Investment securities: |  |
Equity securities | $ 313 | $ 475
Debt securities and other | 8,956 | 13,535
Derivatives | 1,790 | 1,089
Total assets | 11,059 | 15,099
Level 1 [Member] |  |
Investment securities: |  |
Equity securities | 313 | 475
Debt securities and other | 0 | 0
Derivatives | 0 | 0
Total assets | 313 | 475
Level 2 [Member] |  |
Investment securities: |  |
Equity securities | 0 | 0
Debt securities and other | 8,956 | 13,535
Derivatives | 1,790 | 1,089
Total assets | 10,746 | 14,624
Level 3 [Member] |  |
Investment securities: |  |
Total assets | $ 0 | $ 0

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