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Fair Value Measurements - Financial Instruments Not Carried at Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Financing Receivable, after Allowance for Credit Loss $ 6,396 $ 6,087    
Policyholder Account Balance 614 638 $ 658  
Commercial Loan [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Financing Receivable, after Allowance for Credit Loss 6,396 6,087    
Financing Receivable, Allowance for Credit Loss 44 51 $ 36 $ 29
Significant Unobservable Inputs (Level 3) | Carrying Amount [1]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Financing Receivable, after Allowance for Credit Loss 6,396 6,087    
Policyholder Account Balance 614 638    
Significant Unobservable Inputs (Level 3) | Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Financing Receivable, after Allowance for Credit Loss 5,901 5,584    
Policyholder Account Balance 614 639    
Significant Observable Inputs (Level 2) | Carrying Amount [1]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Senior Notes and Debentures 3,867 3,863    
Junior Subordinated Debentures 499 499    
Significant Observable Inputs (Level 2) | Fair Value        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Senior Notes and Debentures 3,406 3,533    
Junior Subordinated Debentures $ 460 $ 429