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Fair Values (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Investment securities: |  |
Equity securities and other | $ 49 | $ 49
Debt securities | 3,201 | 3,108
Derivatives | 235 | 765
Total assets | 3,485 | 3,922
Level 1 [Member] |  |
Investment securities: |  |
Equity securities and other | 1 | 1
Debt securities | 1,118 | 460
Derivatives | 0 | 0
Total assets | 1,119 | 461
Level 2 [Member] |  |
Investment securities: |  |
Equity securities and other | 48 | 48
Debt securities | 2,083 | 2,648
Derivatives | 235 | 765
Total assets | 2,366 | 3,461
Level 3 [Member] |  |
Investment securities: |  |
Equity securities and other | 0 | 0
Debt securities | 0 | 0
Derivatives | 0 | 0
Total assets | $ 0 | $ 0

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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Includes assets not subject to a master netting arrangement. + References No definition available. + Details
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