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Fair Value Measurements - Financial Instruments Not Carried at Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, carrying value | $ 76,578 | $ 74,111 |  |
Assets, fair value | 48,805 | 49,779 |  |
Liabilities, carrying value | 58,735 | 55,555 |  |
Financing Receivable, Allowance for Credit Loss |  |  | $ 0 |
Commercial Loan [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | 29 | 38 | $ 0 | $ 1
Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, fair value | 2,709 | 1,805 |  |
Significant Unobservable Inputs (Level 3) | Other policyholder funds and benefits payable | Carrying Amount [1] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Liabilities, carrying value | 687 | 701 |  |
Significant Unobservable Inputs (Level 3) | Other policyholder funds and benefits payable | Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Liabilities, fair value | 689 | 703 |  |
Significant Unobservable Inputs (Level 3) | Mortgage loans | Carrying Amount [1] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, carrying value | 5,383 | 4,493 |  |
Significant Unobservable Inputs (Level 3) | Mortgage loans | Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, fair value | 5,576 | 4,792 |  |
Significant Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, fair value | 42,134 | 43,910 |  |
Significant Observable Inputs (Level 2) | Senior Notes | Carrying Amount [1] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Liabilities, carrying value | 3,854 | 3,262 |  |
Significant Observable Inputs (Level 2) | Senior Notes | Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Liabilities, fair value | 4,725 | 4,363 |  |
Significant Observable Inputs (Level 2) | Junior Subordinated Debentures | Carrying Amount [1] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Liabilities, carrying value | 1,090 | 1,090 |  |
Significant Observable Inputs (Level 2) | Junior Subordinated Debentures | Fair Value |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Liabilities, fair value | $ 1,086 | $ 1,107 |  |

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