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Income Taxes Income Taxes - Effect of Income Taxes on Net Income and Stockholders' Equity (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Expense (Benefit) [Roll Forward] |  |  |
Income tax expense (benefit) | $ 7 | $ 2 | $ 18
Net Unrealized Losses On Securities Tax Effect | 12 | (47) | (3)
Valuation Allowances And Reserves Charged To Equity | (9) | 41 | (1)
Income Tax Effects Allocated Directly to Equity | 2 | (6) | (2)
Change in retirement benefits Tax Effect | (1) | 0 | 0
Credit Risk Changes to Fair Value Options Tax Effect | 0 | 0 | 0
Income Tax Effects Allocated Directly to Equity, Other | $ 9 | $ (4) | $ 16

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