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Fair Value Measurements - Significant Unobservable Inputs - Securities (Details) $ in Millions | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | $ 42,847 | $ 45,035
CLOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | 3,025 | 2,780
CMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | 4,119 | 4,484
Corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | 18,707 | 20,273
Residential mortgage-backed securities ("RMBS") |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | 3,643 | 4,107
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | 2,404 | 1,705
Significant Unobservable Inputs (Level 3) | CLOs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | 257 | 360
Significant Unobservable Inputs (Level 3) | CMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | 196 | 77
Significant Unobservable Inputs (Level 3) | Corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities | 1,618 | 881
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 | 328 | 381
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 | $ 211 | $ 340
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 | 2.34 | 3.04
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 | 2.58 | 3.05
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 | 2.57 | 3.04
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 | $ 192 | $ 20
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 | 2.03 | 2.55
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 | 4.68 | 9.75
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 | 2.66 | 6.88
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 | $ 1,532 | $ 749
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 | 0.96 | 1.10
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 | 12.27 | 6.92
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 | 2.98 | 2.93
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 | $ 266 | $ 364
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 | 0.48 | 0.07
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 | 2.29 | 9.37
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 | 0.89 | 1.19
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 | 0.02 | 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 | 0.16 | 0.10
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 | 0.07 | 0.05
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 | 0.01 | 0.02
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 | 0.63 | 0.84

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