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Fair Value Measurements - Financial Instruments Not Carried at Fair Value (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, carrying value | $ 74,201 | $ 74,111 |  |
Assets, fair value | 48,628 | 49,779 |  |
Liabilities, carrying value | 56,499 | 55,555 |  |
Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, fair value | 2,004 | 1,805 |  |
Significant Observable Inputs (Level 2) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Assets, fair value | 43,301 | 43,910 |  |
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 | 681 | 701 |  |
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 | 4,588 | 4,493 |  |
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 | 3,263 | 3,262 |  |
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 | 1,090 | 1,090 |  |
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 | 683 | 703 |  |
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 | 4,768 | 4,792 |  |
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 | 3,965 | 4,363 |  |
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 | 1,128 | 1,107 |  |
Commercial Loan [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | $ 34 | $ 38 | $ 21 | $ 0

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