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Fair Value Measurements - Financial Instruments Not Carried at Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets, carrying value $ 74,516   $ 73,008      
Assets, fair value 42,427   42,258      
Liabilities, carrying value 60,837   59,332      
Significant
Unobservable
Inputs
(Level 3)            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets, fair value 2,504   2,483      
Significant
Observable
Inputs
(Level 2)            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Assets, fair value 38,331   37,085      
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 645   658      
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 6,016   6,000      
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 3,862   3,858      
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 499   499      
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 645   658      
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 5,309   5,362      
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 3,193   3,339      
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 425   419      
Commercial Loan [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Financing Receivable, Allowance for Credit Loss $ 46 $ 41 $ 36 $ 36 $ 36 $ 29