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Fair Value Measurements - Significant Unobservable Inputs - Securities (Details) $ in Millions | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities, AFS | $ 36,231 | $ 42,847
CLO |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities, AFS | 2,941 | 3,025
CMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities, AFS | 3,368 | 4,119
Corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities, AFS | 15,233 | 18,707
Residential mortgage-backed securities ("RMBS") |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities, AFS | 3,708 | 3,643
Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities, AFS | 2,051 | 2,404
Significant Unobservable Inputs (Level 3) | CLO |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities, AFS | 115 | 257
Significant Unobservable Inputs (Level 3) | CMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities, AFS | 222 | 196
Significant Unobservable Inputs (Level 3) | Corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities, AFS | 1,589 | 1,618
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, AFS | 95 | 328
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | CLO |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturities, AFS | $ 115 | $ 211
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | CLO | 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 | 3.37 | 2.34
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | CLO | 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 | 3.37 | 2.58
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | CLO | 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 | 3.37 | 2.57
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, AFS | $ 219 | $ 192
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 | 4.19 | 2.03
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 | 13.07 | 4.68
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 | 5.27 | 2.66
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, AFS | $ 1,541 | $ 1,532
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 | 0.77 | 0.96
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 | 6.42 | 12.27
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 | 3.60 | 2.98
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, AFS | $ 65 | $ 266
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 | 0.62 | 0.48
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 | 2.49 | 2.29
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 | 1.60 | 0.89
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 | 0.01 | 0.02
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 | 0.16
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 | 0.07
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 | 0.01
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 | 0.04 | 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 | 0.02 | 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 | 0.10 | 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 | 0.38 | 0.63

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