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Contingencies, Commitments and Guarantees (Contingencies, Commitments and Guarantees - Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]      
Cumulative maximum indemnities and guarantees contractual limitation   $ 82  
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   271 374
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   $ 1,700 $ 1,400