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Contingencies, Commitments and Guarantees (Contingencies, Commitments and Guarantees - Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Cumulative maximum indemnities and guarantees contractual limitation $ 83  
Liabilities for indemnities, guarantees and commitments 0 $ 1
Premium Receivable, Allowance for Credit Loss, Period Increase (Decrease) 187  
Loss Contingency, Estimate of Possible Loss 0  
Universal Life Insurance    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Premium Receivable, Allowance for Credit Loss, Period Increase (Decrease) 167  
Other Expense    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Premium Receivable, Allowance for Credit Loss, Period Increase (Decrease) 20  
Maximum    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Loss contingency, range of possible loss, portion not accrued 10  
Mortgage Loan Commitments    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fair value disclosure, off-balance sheet risks, face amount, liability 408 374
Commitments to Fund Partnership Investments and Private Corporate Bond Investments    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fair value disclosure, off-balance sheet risks, face amount, liability $ 1,600 $ 1,400