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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Amount |  |  |
Income (loss) before income taxes times 21% statutory federal tax rate | $ 244 | $ 490 | $ 683
Amortization of tax-advantaged investments | 171 | 149 | 151
Tax-exempt interest income | (35) | (28) | (26)
Corporate-owned life insurance income | (28) | (28) | (27)
State income tax, net of federal tax benefit | 18 | 53 | 79
Tax credits | (196) | (204) | (218)
FDIC Insurance | 22 | 12 | 7
Other | 0 | (22) | (7)
Total income tax expense (benefit) | $ 196 | $ 422 | $ 642
Rate |  |  |
Income (loss) before income taxes times 21% statutory federal tax rate | 21.00% | 21.00% | 21.00%
Amortization of tax-advantaged investments | 14.80% | 6.40% | 4.60%
Tax-exempt interest income | (3.10%) | (1.20%) | (0.80%)
Corporate-owned life insurance income | (2.40%) | (1.20%) | (0.80%)
State income tax, net of federal tax benefit | 1.60% | 2.30% | 2.40%
Tax credits | (16.90%) | (8.80%) | (6.70%)
FDIC Insurance | 1.90% | 0.50% | 0.30%
Other | 0.00% | (0.90%) | (0.30%)
Total income tax expense (benefit) | 16.90% | 18.10% | 19.70%

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