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Fair Values (Details) (USD $) | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Investment securities: |  |
Equity securities | $ 168,000,000 | $ 296,000,000
Debt securities and other | 4,969,000,000 | 5,318,000,000
Derivatives | 662,000,000 | 942,000,000
Total assets | 5,799,000,000 | 6,556,000,000
Level 1 [Member] |  |
Investment securities: |  |
Equity securities | 168,000,000 | 296,000,000
Debt securities and other | 232,000,000 | 338,000,000
Derivatives | 0 | 0
Total assets | 400,000,000 | 634,000,000
Level 2 [Member] |  |
Investment securities: |  |
Equity securities | 0 | 0
Debt securities and other | 4,737,000,000 | 4,980,000,000
Derivatives | 662,000,000 | 942,000,000
Total assets | 5,399,000,000 | 5,922,000,000
Level 3 [Member] |  |
Investment securities: |  |
Total assets | $ 0 | $ 0

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