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Fair Values (Details) (USD $) | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | ---
Investment securities: |  |
Equity securities | $ 360,000,000 | $ 475,000,000
Debt securities and other | 6,787,000,000 | 13,535,000,000
Derivatives | 1,516,000,000 | 1,089,000,000
Total assets | 8,663,000,000 | 15,099,000,000
Level 1 [Member] |  |
Investment securities: |  |
Equity securities | 360,000,000 | 475,000,000
Debt securities and other | 340,000,000 | 0
Derivatives | 0 | 0
Total assets | 700,000,000 | 475,000,000
Level 2 [Member] |  |
Investment securities: |  |
Equity securities | 0 | 0
Debt securities and other | 6,447,000,000 | 13,535,000,000
Derivatives | 1,516,000,000 | 1,089,000,000
Total assets | 7,963,000,000 | 14,624,000,000
Level 3 [Member] |  |
Investment securities: |  |
Total assets | $ 0 | $ 0

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