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Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Tax Disclosure [Abstract]        
Tax provision at U.S. federal statutory rate $ 95 $ 112 $ 258 $ 221
Tax-exempt interest (14) (17) (29) (34)
Executive compensation 1 3 5 7
Stock-based compensation 1 0 4 2
Tax Reform 0 (5) 0 (2)
Other 3 0 (1) 0
Provision for income taxes $ 84 $ 103 $ 229 $ 194