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Fair Values (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Investment securities: |  |
Equity securities | $ 81 | $ 78
Debt securities | 21,550 | 8,328
Derivatives, gross | 629 | 343
Total assets | 22,260 | 8,749
Liabilities |  |
Derivatives, gross | 702 | 440
Total derivatives | 702 | 440
Fair Value, Inputs, Level 1 [Member] |  |
Investment securities: |  |
Equity securities | 80 | 77
Debt securities | 0 | 0
Derivatives, gross | 0 | 0
Total assets | 80 | 77
Liabilities |  |
Derivatives, gross | 0 | 0
Total derivatives | 0 | 0
Fair Value, Inputs, Level 2 [Member] |  |
Investment securities: |  |
Equity securities | 1 | 1
Debt securities | 21,550 | 8,328
Derivatives, gross | 629 | 343
Total assets | 22,180 | 8,672
Liabilities |  |
Derivatives, gross | 702 | 440
Total derivatives | 702 | 440
Fair Value, Inputs, Level 3 [Member] |  |
Investment securities: |  |
Equity securities | 0 | 0
Debt securities | 0 | 0
Derivatives, gross | 0 | 0
Total assets | 0 | 0
Liabilities |  |
Derivatives, gross | 0 | 0
Total derivatives | $ 0 | $ 0

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