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Fair Values (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Investment securities: |  |
Equity securities | $ 251 | $ 296
Debt securities and other | 5,542 | 5,318
Derivative assets | 958 | 942
Total assets | 6,751 | 6,556
Level 1 [Member] |  |
Investment securities: |  |
Equity securities | 251 | 296
Debt securities and other | 337 | 338
Derivative assets | 0 | 0
Total assets | 588 | 634
Level 2 [Member] |  |
Investment securities: |  |
Equity securities | 0 | 0
Debt securities and other | 5,205 | 4,980
Derivative assets | 958 | 942
Total assets | 6,163 | 5,922
Level 3 [Member] |  |
Investment securities: |  |
Total assets | $ 0 | $ 0

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