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Fair Value of Assets and Liabilities - Schedule of Financial Instruments Not Carried at Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Financial assets |  |  |  |
Mortgage loans | $ 815 | $ 822 |  |
Financial liabilities |  |  |  |
Debt | 7,938 | 7,942 |  |
Liability for collateral | 2,049 | 1,891 | $ 1,807 | $ 2,011
Significant unobservable inputs (Level 3) | Amortized cost, net |  |  |  |
Financial assets |  |  |  |
Mortgage loans | 815 | 822 |  |
Bank loans | 164 | 224 |  |
Financial liabilities |  |  |  |
Contractholder funds on investment contracts | 44 | 46 |  |
Significant unobservable inputs (Level 3) | Fair value |  |  |  |
Financial assets |  |  |  |
Mortgage loans | 762 | 769 |  |
Bank loans | 177 | 238 |  |
Financial liabilities |  |  |  |
Contractholder funds on investment contracts | 44 | 46 |  |
Significant other observable inputs (Level 2) | Amortized cost, net |  |  |  |
Financial liabilities |  |  |  |
Debt | 7,938 | 7,942 |  |
Liability for collateral | 2,049 | 1,891 |  |
Significant other observable inputs (Level 2) | Fair value |  |  |  |
Financial liabilities |  |  |  |
Debt | 7,590 | 7,655 |  |
Liability for collateral | $ 2,049 | $ 1,891 |  |

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