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Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]      
Tax provision at U.S. federal statutory rate $ 608 $ 445 $ 538
Tax-exempt interest (40) (46) (56)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount 9 9 2
Effective Income Tax Rate Reconciliation, Disposition of Business, Amount (5) (8) 0
Effective Income Tax Rate Reconciliation, Deduction, Other, Amount (22) (6) (11)
Effective Income Tax Rate Reconciliation, Tax Credit, Amount (9) (5) 0
Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Amount 0 (5) 0
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount 8 6 0
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount 2 (5) (2)
Total income tax expense (benefit) $ 531 $ 383 $ 475