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Derivatives (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Derivatives, Fair Value [Line Items]      
Estimated Fair Value Assets $ 11,411 $ 10,466  
Estimated Fair Value Liabilities 6,975 3,852  
Maximum Amount of Future Payments under Credit Default Swaps 11,512 8,626  
Estimated Fair Value of Credit Default Swaps 105 165  
Excess cash collateral received on derivatives 252 $ 172  
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 4 years 8 months 12 days 4 years 7 months 6 days  
Net investment gains (losses) $ (1,262) $ 1,529 $ (110)
Derivative Instrument Detail [Abstract]      
Net amounts reclassified into net derivatives gains (losses) on discontinued cash flow hedges $ 30 $ (1) 21
Hedging exposure to variability in future cash flows for specific length of time 6 years 7 years  
Accumulated Other Comprehensive Income Loss $ 2,000 $ 2,100  
Deferred net gains (losses) expected to be reclassified to earnings 156    
Cumulative foreign currency translation gain (loss) recorded in accumulated other comprehensive income (loss) for net investment in foreign operations hedges 435 303  
Excess securities collateral provided on derivatives 125 126  
Ba [Member]      
Derivatives, Fair Value [Line Items]      
Maximum Amount of Future Payments under Credit Default Swaps 87 102  
Estimated Fair Value of Credit Default Swaps $ 2 $ 0  
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Average Remaining Maturity 2 years 1 month 6 days 2 years  
Nonperformance Risk [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Embedded derivative gains (losses) $ 18 $ (17) (10)
Over the Counter [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Collateral, Obligation to Return Cash, Offset 5,432 6,948  
Excess securities collateral received on derivatives (398) (160)  
Excess securities collateral provided on derivatives (1,200) (243)  
Exchange Cleared [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Collateral, Obligation to Return Cash, Offset 35 421  
Excess securities collateral provided on derivatives (1,000) (1,200)  
Exchange Traded [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Collateral, Obligation to Return Cash, Offset 0 0  
Excess securities collateral provided on derivatives (184) (185)  
Cash Flow Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Net investment gains (losses) 19 82 $ 207
Credit Index Product [Member] | Ba [Member]      
Derivatives, Fair Value [Line Items]      
Maximum Amount of Future Payments under Credit Default Swaps 25 20  
Estimated Fair Value of Credit Default Swaps $ 2 $ (1)  
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Average Remaining Maturity 4 years 5 years  
Accrued Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Estimated Fair Value Assets $ 166 $ 130  
Estimated Fair Value Liabilities $ 0 $ (23)