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Derivatives (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Derivatives, Fair Value [Line Items]      
Estimated Fair Value Assets $ 8,212 $ 8,737  
Estimated Fair Value Liabilities 7,259 6,298  
Maximum Amount of Future Payments under Credit Default Swaps 11,764 12,468  
Estimated Fair Value of Credit Default Swaps 196 228  
Excess cash collateral received on derivatives 26 $ 163  
Securities collateral received which the company is permitted to sell or repledge, amount that has been sold or repledged $ 0    
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Average Remaining Maturity 3 years 4 months 24 days 4 years 6 months  
Net investment gains (losses) $ (1,184) $ (2,824) $ (1,260)
Derivative Instrument Detail [Abstract]      
Net amounts reclassified into net derivatives gains (losses) on discontinued cash flow hedges $ 4 $ 31 30
Hedging exposure to variability in future cash flows for specific length of time 4 years 5 years  
Accumulated Other Comprehensive Income Loss $ 357 $ 166  
Deferred net gains (losses) expected to be reclassified to earnings (18)    
Cumulative foreign currency translation gain (loss) recorded in accumulated other comprehensive income (loss) for net investment in foreign operations hedges 1,100 681  
Excess securities collateral provided on derivatives 86 98  
Ba [Member]      
Derivatives, Fair Value [Line Items]      
Maximum Amount of Future Payments under Credit Default Swaps 42 42  
Estimated Fair Value of Credit Default Swaps $ 2 $ 2  
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Average Remaining Maturity 1 year 7 months 6 days 2 years 7 months 6 days  
Over the Counter [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Collateral, Obligation to Return Cash, Offset $ 2,597 $ 3,448  
Excess securities collateral received on derivatives (410) (298)  
Excess securities collateral provided on derivatives (1,200) (1,500)  
Exchange Cleared [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Collateral, Obligation to Return Cash, Offset 126 150  
Excess securities collateral provided on derivatives (835) (945)  
Exchange Traded [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Collateral, Obligation to Return Cash, Offset 0 0  
Excess securities collateral provided on derivatives (148) (137)  
Cash Flow Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Net investment gains (losses) (9) 102 $ 19
Accrued Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Estimated Fair Value Assets 158 181  
Estimated Fair Value Liabilities 13 9  
Credit Index Product [Member] | Ba [Member]      
Derivatives, Fair Value [Line Items]      
Maximum Amount of Future Payments under Credit Default Swaps 25 25  
Estimated Fair Value of Credit Default Swaps $ 2 $ 2  
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Average Remaining Maturity 2 years 3 years