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Income Taxes - Total Income Tax Expense (Benefit) and Resulting Effective Tax Rate (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Income (loss) before income taxes times 21% (35% for 2017) statutory federal tax rate | $ 425 | $ 463 | $ 675
Amortization of tax-advantaged investments | 132 | 127 | 104
Foreign tax adjustments | 0 | 2 | 1
Tax-exempt interest income | (30) | (30) | (37)
Corporate-owned life insurance income | (29) | (29) | (46)
State income tax, net of federal tax benefit | 31 | 34 | 19
Tax credits | (231) | (234) | (218)
Tax Cuts and Jobs Act | 0 | 7 | 147
Other | 16 | 4 | (8)
Total income tax expense (benefit) | $ 314 | $ 344 | $ 637
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Federal income tax rate | 21.00% | 21.00% | 35.00%
Amortization of tax-advantaged investments (as a percent) | 6.50% | 5.80% | 5.40%
Foreign tax adjustments (as a percent) | 0.00% | 0.10% | 0.10%
Tax-exempt interest income (as a percent) | (1.50%) | (1.40%) | (1.90%)
Corporate-owned life insurance income (as a percent) | (1.40%) | (1.30%) | (2.40%)
State income tax, net of federal tax benefit (as a percent) | 1.50% | 1.50% | 1.00%
Tax credits (as a percent) | (11.40%) | (10.60%) | (11.30%)
Tax Cuts and Jobs Act (as a percent) | 0 | 0.003 | 0.076
Other (as a percent) | 0.90% | 0.20% | (0.50%)
Total income tax expense (benefit) (as a percent) | 15.60% | 15.60% | 33.00%

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