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Fair Value Measurements - Financial Instruments Not Carried at Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, carrying value $ 76,578 $ 74,111    
Assets, fair value 48,805 49,779    
Liabilities, carrying value 58,735 55,555    
Financing Receivable, Allowance for Credit Loss     $ 0  
Commercial Loan [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Financing Receivable, Allowance for Credit Loss 29 38 $ 0 $ 1
Significant Unobservable Inputs (Level 3)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value 2,709 1,805    
Significant Unobservable Inputs (Level 3) | Other policyholder funds and benefits payable | Carrying Amount [1]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Liabilities, carrying value 687 701    
Significant Unobservable Inputs (Level 3) | Other policyholder funds and benefits payable | Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Liabilities, fair value 689 703    
Significant Unobservable Inputs (Level 3) | Mortgage loans | Carrying Amount [1]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, carrying value 5,383 4,493    
Significant Unobservable Inputs (Level 3) | Mortgage loans | Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value 5,576 4,792    
Significant Observable Inputs (Level 2)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value 42,134 43,910    
Significant Observable Inputs (Level 2) | Senior Notes | Carrying Amount [1]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Liabilities, carrying value 3,854 3,262    
Significant Observable Inputs (Level 2) | Senior Notes | Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Liabilities, fair value 4,725 4,363    
Significant Observable Inputs (Level 2) | Junior Subordinated Debentures | Carrying Amount [1]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Liabilities, carrying value 1,090 1,090    
Significant Observable Inputs (Level 2) | Junior Subordinated Debentures | Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Liabilities, fair value $ 1,086 $ 1,107