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Fair Values (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Investment securities: |  |
Equity securities | $ 47 | $ 48
Debt securities | 4,706 | 3,111
Derivative assets | 510 | 210
Total assets | 5,263 | 3,369
Liabilities |  |
Derivative liabilities | 279 | 218
Total liabilities | 279 | 218
Level 1 [Member] |  |
Investment securities: |  |
Equity securities | 1 | 1
Debt securities | 2,893 | 1,045
Derivative assets | 0 | 0
Total assets | 2,894 | 1,046
Liabilities |  |
Derivative liabilities | 0 | 0
Total liabilities | 0 | 0
Level 2 [Member] |  |
Investment securities: |  |
Equity securities | 46 | 47
Debt securities | 1,813 | 2,066
Derivative assets | 510 | 210
Total assets | 2,369 | 2,323
Liabilities |  |
Derivative liabilities | 279 | 218
Total liabilities | 279 | 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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