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Fair Value Measurements - Financial Instruments Not Carried at Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, carrying value $ 73,022 $ 76,578    
Assets, fair value 42,258 48,805    
Liabilities, carrying value 59,391 58,735    
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 36 29 $ 38 $ 0
Significant Unobservable Inputs (Level 3)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value 2,483 2,709    
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 658 687    
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 658 689    
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 6,000 5,383    
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 5,362 5,576    
Significant Observable Inputs (Level 2)        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Assets, fair value 37,085 42,134    
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 3,858 3,854    
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 3,339 4,725    
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 499 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 $ 419 $ 1,086