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Fair Value Measurements - Information about Valuation Inputs for Variable Interest Entity Assets and Liabilities Classified as Level 3 (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Variable Interest Entity, Primary Beneficiary [Member]        
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31)        
Estimated Future Premium Payments Minimum Discounted Rate 3.20%      
Estimated Future Premium Payments Maximum Discounted Rate 5.30%      
Fair Value, Inputs, Level 3 [Member]        
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31)        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability $ 5,738 $ 6,194 $ 6,199 $ 6,376
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings (204) (145)    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss (176) 49    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements (80) (86)    
Fair Value, Inputs, Level 3 [Member] | Investments [Member]        
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31)        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability 86 76 91 78
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 0 0    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss (4) (2)    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements (1) 0    
Fair Value, Inputs, Level 3 [Member] | Other Assets [Member]        
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31)        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability 0 1 0 1
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings 0 0    
Loan Origination Commitments [Member] | Fair Value, Inputs, Level 3 [Member] | Loans Receivable [Member] | Variable Interest Entity, Primary Beneficiary [Member]        
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31)        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability 2,469 2,948 2,718 2,998
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings (96) 9    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss (76) 24    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements (78) (84)    
Derivative Financial Instruments, Liabilities [Member] | Fair Value, Inputs, Level 3 [Member] | Derivative Financial Instruments, Liabilities [Member]        
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31)        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability 52 65 70 84
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings (17) (17)    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Settlements (2) (2)    
Investment Contracts [Member] | Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] | Variable Interest Entity, Primary Beneficiary [Member]        
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] (Deprecated 2018-01-31)        
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability 3,131 3,103 $ 3,320 $ 3,215
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Earnings (93) (138)    
Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Or Liability Gain Loss Included In Other Comprehensive Income Loss $ (96) $ 26