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Fair Value Measurements - Summary of Gains and Losses (Realized and Unrealized) Relating to Level 3 Assets and Liabilities Included in Earnings (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Net Investment Income [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Total gains or losses included in earnings for the period $ 0 $ 0   $ 1 $ 1
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held 0 0 $ 0 0  
Interest Rate Swap [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held     23 (6)  
Gain (Loss) on Derivative Instruments [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Total gains or losses included in earnings for the period 0 1   (6) $ 24
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held 0 1      
Income Loss On Variable Interest Entities [Member] | Variable Interest Entity, Primary Beneficiary [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Total gains or losses included in earnings for the period 76 (41) 137 100  
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held 76 (41) 137 100  
Other Income or (Loss) [Member]          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Total gains or losses included in earnings for the period 0 0 (1) 0  
Fair Value Asset Or Liability Measured On Recurring Basis Change In Unrealized Gains Losses Still Held $ 0 $ 0 $ (1) $ 0