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Fair Value Measurements - Financial Instruments Not Carried at Fair Value (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets, carrying value $ 74,732   $ 74,111      
Assets, fair value 49,128   49,779      
Liabilities, carrying value 56,488   55,555      
Significant
Unobservable
Inputs
(Level 3)            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets, fair value 2,010   1,805      
Significant
Observable
Inputs
(Level 2)            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets, fair value 43,603   43,910      
Carrying Amount | Significant
Unobservable
Inputs
(Level 3) | Other policyholder funds and benefits payable            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Liabilities, carrying value 685   701      
Carrying Amount | Significant
Unobservable
Inputs
(Level 3) | Mortgage loans            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets, carrying value 4,876   4,493      
Carrying Amount | Significant
Observable
Inputs
(Level 2) | Senior notes [2]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Liabilities, carrying value 3,264   3,262      
Carrying Amount | Significant
Observable
Inputs
(Level 2) | Junior subordinated debentures [2]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Liabilities, carrying value 1,090   1,090      
Fair Value | Significant
Unobservable
Inputs
(Level 3) | Other policyholder funds and benefits payable            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Liabilities, fair value 687   703      
Fair Value | Significant
Unobservable
Inputs
(Level 3) | Mortgage loans            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets, fair value 5,110   4,792      
Fair Value | Significant
Observable
Inputs
(Level 2) | Senior notes [2]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Liabilities, fair value 4,153   4,363      
Fair Value | Significant
Observable
Inputs
(Level 2) | Junior subordinated debentures [2]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Liabilities, fair value 1,121   1,107      
Commercial Loan [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Financing Receivable, Allowance for Credit Loss $ 24 $ 34 $ 38 $ 43 $ 21 $ 0