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Fair Values (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Investment securities: |  |
Equity securities | $ 47 | $ 48
Debt securities | 6,024 | 3,111
Derivative assets | 327 | 210
Total assets | 6,398 | 3,369
Liabilities |  |
Derivative liabilities | 402 | 218
Total liabilities | 402 | 218
Level 1 [Member] |  |
Investment securities: |  |
Equity securities | 1 | 1
Debt securities | 4,651 | 1,045
Derivative assets | 0 | 0
Total assets | 4,652 | 1,046
Liabilities |  |
Derivative liabilities | 0 | 0
Total liabilities | 0 | 0
Level 2 [Member] |  |
Investment securities: |  |
Equity securities | 46 | 47
Debt securities | 1,373 | 2,066
Derivative assets | 327 | 210
Total assets | 1,746 | 2,323
Liabilities |  |
Derivative liabilities | 402 | 218
Total liabilities | 402 | 218
Level 3 [Member] |  |
Investment securities: |  |
Equity securities | 0 | 0
Debt securities | 0 | 0
Derivative assets | 0 | 0
Total assets | 0 | 0
Liabilities |  |
Derivative liabilities | 0 | 0
Total liabilities | $ 0 | $ 0

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