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Fair Value Measurements - Financial Instruments Not Carried at Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, carrying value $ 74,111 $ 70,817    
Assets, fair value 49,779 46,738    
Liabilities, carrying value 55,555 54,547    
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 38 0 $ 1 $ 1
Significant Unobservable Inputs (Level 3)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value 1,805 1,502    
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 701 763    
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 703 765    
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 4,493 4,215    
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 4,792 4,350    
Significant Observable Inputs (Level 2)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value 43,910 42,477    
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 3,262 3,759    
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 4,363 4,456    
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 1,089    
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 $ 1,107 $ 1,153