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Fair Value Measurements - Financial Instruments Not Carried at Fair Value (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets, carrying value | $ 74,516 |  | $ 73,008 |  |  |
Assets, fair value | 42,427 |  | 42,258 |  |  |
Liabilities, carrying value | 60,837 |  | 59,332 |  |  |
Significant Unobservable Inputs (Level 3) |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets, fair value | 2,504 |  | 2,483 |  |  |
Significant Observable Inputs (Level 2) |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets, fair value | 38,331 |  | 37,085 |  |  |
Carrying Amount | Significant Unobservable Inputs (Level 3) | Other policyholder funds and benefits payable |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Liabilities, carrying value | 645 |  | 658 |  |  |
Carrying Amount | Significant Unobservable Inputs (Level 3) | Mortgage loans |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets, carrying value | 6,016 |  | 6,000 |  |  |
Carrying Amount | Significant Observable Inputs (Level 2) | Senior notes [2] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Liabilities, carrying value | 3,862 |  | 3,858 |  |  |
Carrying Amount | Significant Observable Inputs (Level 2) | Junior subordinated debentures [2] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Liabilities, carrying value | 499 |  | 499 |  |  |
Fair Value | Significant Unobservable Inputs (Level 3) | Other policyholder funds and benefits payable |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Liabilities, fair value | 645 |  | 658 |  |  |
Fair Value | Significant Unobservable Inputs (Level 3) | Mortgage loans |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets, fair value | 5,309 |  | 5,362 |  |  |
Fair Value | Significant Observable Inputs (Level 2) | Senior notes [2] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Liabilities, fair value | 3,193 |  | 3,339 |  |  |
Fair Value | Significant Observable Inputs (Level 2) | Junior subordinated debentures [2] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Liabilities, fair value | 425 |  | 419 |  |  |
Commercial Loan [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | $ 46 | $ 41 | $ 36 | $ 36 | $ 36 | $ 29

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