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Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Tax Disclosure [Abstract]        
Tax provision at U.S. federal statutory rate $ 138 $ 112 $ 396 $ 333
Tax-exempt interest (14) (16) (43) (50)
Effective Income Tax Rate Reconciliation, Deduction, Dividends, Amount (3) 0 (5) 0
Executive compensation 0 1 5 8
Stock-based compensation 3 3 7 5
Tax Reform 0 11 0 13
Other 0 2 (1) 2
Provision for income taxes $ 118 $ 103 $ 347 $ 297