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Fair Value Measurements - Significant Unobservable Inputs - Securities (Details) $ in Millions | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | $ 45,035 | $ 42,148
CMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | 4,484 | 4,338
Corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | 20,273 | 17,396
Residential mortgage-backed securities ("RMBS") |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | 4,107 | 4,869
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | 1,705 | 1,414
Significant Unobservable Inputs (Level 3) | CMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | 77 | 9
Significant Unobservable Inputs (Level 3) | Corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | 881 | 732
Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities ("RMBS") |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | 381 | 560
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | CLOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | $ 340 | $ 95
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | CLOs | Measurement Input, Credit Spread [Member] | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 3.04 | 2.46
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | CLOs | Measurement Input, Credit Spread [Member] | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 3.05 | 2.46
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | CLOs | Measurement Input, Credit Spread [Member] | Weighted Average Expected Life |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 3.04 | 2.46
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | CMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | $ 20 | $ 1
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | CMBS | Measurement Input, Credit Spread [Member] | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 2.55 | 0.09
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | CMBS | Measurement Input, Credit Spread [Member] | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 9.75 | 18.32
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | CMBS | Measurement Input, Credit Spread [Member] | Weighted Average Expected Life |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 6.88 | 1.61
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | $ 749 | $ 633
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Corporate | Measurement Input, Credit Spread [Member] | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 1.10 | 0.93
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Corporate | Measurement Input, Credit Spread [Member] | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 6.92 | 7.88
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Corporate | Measurement Input, Credit Spread [Member] | Weighted Average Expected Life |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 2.93 | 2.36
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Residential mortgage-backed securities ("RMBS") |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | $ 364 | $ 560
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Residential mortgage-backed securities ("RMBS") | Measurement Input, Credit Spread [Member] | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.07 | 0.05
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Residential mortgage-backed securities ("RMBS") | Measurement Input, Credit Spread [Member] | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 9.37 | 2.33
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Residential mortgage-backed securities ("RMBS") | Measurement Input, Credit Spread [Member] | Weighted Average Expected Life |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 1.19 | 0.79
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Residential mortgage-backed securities ("RMBS") | Measurement Input, Constant Prepayment Rate [Member] | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Residential mortgage-backed securities ("RMBS") | Measurement Input, Constant Prepayment Rate [Member] | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.10 | 0.11
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Residential mortgage-backed securities ("RMBS") | Measurement Input, Constant Prepayment Rate [Member] | Weighted Average Expected Life |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.05 | 0.06
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Residential mortgage-backed securities ("RMBS") | Measurement Input, Default Rate [Member] | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.02 | 0.01
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Residential mortgage-backed securities ("RMBS") | Measurement Input, Default Rate [Member] | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.06 | 0.06
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Residential mortgage-backed securities ("RMBS") | Measurement Input, Default Rate [Member] | Weighted Average Expected Life |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.03 | 0.03
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Residential mortgage-backed securities ("RMBS") | Measurement Input, Loss Severity [Member] | Minimum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0 | 0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Residential mortgage-backed securities ("RMBS") | Measurement Input, Loss Severity [Member] | Maximum |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 1 | 1
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Residential mortgage-backed securities ("RMBS") | Measurement Input, Loss Severity [Member] | Weighted Average Expected Life |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Debt Securities, Available-for-sale, Measurement Input | 0.84 | 0.70

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