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Fair Value of Assets and Liabilities (Nonrecurring Fair Value Measurements) (Details) - Fair Value, Measurements, Nonrecurring - Level 3 - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Commercial mortgage loans |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Realized investment gains (losses) net | $ (29) | $ 0 | $ 0
Carrying value after measurement as of period end | 34 | 0 |
Mortgage servicing rights |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Realized investment gains (losses) net | 0 | (1) | 6
Carrying value after measurement as of period end | 0 | 77 |
Investment real estate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Realized investment gains (losses) net | (17) | (12) | (15)
Carrying value after measurement as of period end | 113 | 112 |
Investment in JV/LP and Other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Realized investment gains (losses) net | (76) | (129) | 0
Carrying value after measurement as of period end | 186 | 64 |
Goodwill |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Realized investment gains (losses) net | (177) | (903) | $ (1,060)
Carrying value after measurement as of period end | $ 0 | $ 177 |

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