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Derivatives (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Derivatives, Fair Value [Line Items]      
Estimated Fair Value Assets $ 10,084 $ 8,969  
Estimated Fair Value Liabilities 3,737 3,930  
Maximum Amount of Future Payments under Credit Default Swaps 11,520 11,391  
Estimated Fair Value of Credit Default Swaps 271 82  
Excess cash collateral received on derivatives 389 $ 135  
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 3 months 18 days 4 years 3 months 18 days  
Net investment gains (losses) $ 444 $ (298) $ (308)
Derivative Instrument Detail [Abstract]      
Net amounts reclassified into net derivatives gains (losses) on discontinued cash flow hedges $ 58 $ 5 13
Hedging exposure to variability in future cash flows for specific length of time 8 years 4 years  
Accumulated Other Comprehensive Income Loss $ 2,200 $ 2,100  
Deferred net gains (losses) expected to be reclassified to earnings 37    
Cumulative foreign currency translation gain (loss) recorded in accumulated other comprehensive income (loss) for net investment in foreign operations hedges 148 184  
Excess securities collateral provided on derivatives 266 226  
Ba [Member]      
Derivatives, Fair Value [Line Items]      
Maximum Amount of Future Payments under Credit Default Swaps 9 15  
Estimated Fair Value of Credit Default Swaps $ 0 $ 0  
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Average Remaining Maturity 5 years 2 years  
Nonperformance Risk [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Embedded derivative gains (losses) $ (116) $ 133 (190)
Over the Counter [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Collateral, Obligation to Return Cash, Offset 5,317 4,709  
Excess securities collateral received on derivatives (156) (70)  
Excess securities collateral provided on derivatives (189) (212)  
Exchange Cleared [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Collateral, Obligation to Return Cash, Offset 560 145  
Excess securities collateral provided on derivatives (1,000) (601)  
Exchange Traded [Member]      
Derivatives, Fair Value [Line Items]      
Derivative Asset, Collateral, Obligation to Return Cash, Offset 0 0  
Excess securities collateral provided on derivatives (143) (90)  
Cash Flow Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Net investment gains (losses) 8 0 $ 0
Credit Index Product [Member] | Ba [Member]      
Derivatives, Fair Value [Line Items]      
Maximum Amount of Future Payments under Credit Default Swaps $ 0 0  
Estimated Fair Value of Credit Default Swaps   $ 0  
Derivative Instruments, Gain (Loss) [Line Items]      
Derivative, Average Remaining Maturity 0 years 0 years  
Accrued Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Estimated Fair Value Assets $ 111 $ 99  
Estimated Fair Value Liabilities $ (21) $ (59)