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Fair Value Measurements - Financial Instruments Not Carried at Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, carrying value | $ 74,111 | $ 70,817 |  |
Assets, fair value | 49,779 | 46,738 |  |
Liabilities, carrying value | 55,555 | 54,547 |  |
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 | 38 | 0 | $ 1 | $ 1
Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, fair value | 1,805 | 1,502 |  |
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 | 701 | 763 |  |
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 | 703 | 765 |  |
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 | 4,493 | 4,215 |  |
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 | 4,792 | 4,350 |  |
Significant Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, fair value | 43,910 | 42,477 |  |
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 | 3,262 | 3,759 |  |
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 | 4,363 | 4,456 |  |
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 | 1,089 |  |
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 | $ 1,107 | $ 1,153 |  |

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