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Fair Value Measurements - Financial Instruments Not Carried at Fair Value (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets, carrying value | $ 72,319 |  | $ 70,817 |  |  |
Assets, fair value | 48,274 |  | 46,749 |  |  |
Liabilities, carrying value | 54,517 |  | 54,547 |  |  |
Financing Receivable, Allowance for Credit Loss |  |  | 0 |  |  |
Significant Unobservable Inputs (Level 3) |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets, fair value | 1,769 |  | 1,502 |  |  |
Significant Observable Inputs (Level 2) |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Assets, fair value | 42,596 |  | 42,488 |  |  |
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 |  |  | 763 |  |  |
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 | 4,461 |  | 4,215 |  |  |
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 | 3,261 |  | 3,759 |  |  |
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 |  | 1,089 |  |  |
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 | 712 |  | 765 |  |  |
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 | 4,720 |  | 4,350 |  |  |
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 | 4,172 |  | 4,456 |  |  |
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 | 1,093 |  | 1,153 |  |  |
Commercial Loan [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | $ 38 | $ 43 | $ 0 | $ 0 | $ 0 | $ 1

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