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Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Tax provision at U.S. federal statutory rate $ 538 $ 368 $ 253
Tax-exempt interest (56) (66) (123)
Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount (6) (2) (3)
Executive Compensation 7 11 0
Stock-based compensation 7 5 15
Tax Reform 0 39 (877)
Other 1 (1) 4
Total income tax expense (benefit) $ 475 $ 268 $ 985