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Fair Values (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Investment securities: |  |
Equity securities | $ 68 | $ 124
Debt securities and other | 4,693 | 4,892
Derivatives | 600 | 701
Total assets | 5,361 | 5,717
Level 1 [Member] |  |
Investment securities: |  |
Equity securities | 68 | 124
Debt securities and other | 271 | 320
Derivatives | 0 | 0
Total assets | 339 | 444
Level 2 [Member] |  |
Investment securities: |  |
Equity securities | 0 | 0
Debt securities and other | 4,422 | 4,572
Derivatives | 600 | 701
Total assets | 5,022 | 5,273
Level 3 [Member] |  |
Investment securities: |  |
Equity securities | 0 | 0
Debt securities and other | 0 | 0
Derivatives | 0 | 0
Total assets | $ 0 | $ 0

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