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Derivatives (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 04, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]        
Estimated Fair Value Assets   $ 8,969 $ 8,551  
Estimated Fair Value Liabilities   3,930 4,339  
Maximum Amount of Future Payments under Credit Default Swaps   11,391 11,375  
Estimated Fair Value of Credit Default Swaps   82 271  
Excess cash collateral received on derivatives   135 $ 253  
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 4 years 4 months  
Net investment gains (losses)   $ (298) $ (308) $ 317
Embedded derivative gains (losses)   (150) 799 (181)
Derivative Instrument Detail [Abstract]        
Net amounts reclassified into net derivatives gains (losses) on discontinued cash flow hedges   $ 5 $ 13 12
Hedging exposure to variability in future cash flows for specific length of time   4 years 5 years  
Accumulated Other Comprehensive Income Loss   $ 2,100 $ 1,500  
Deferred net gains (losses) expected to be reclassified to earnings   $ (63)    
Immateriality of cash flow effectiveness   no    
Cumulative foreign currency translation gain (loss) recorded in accumulated other comprehensive income (loss) for net investment in foreign operations hedges   $ 184 309  
Potential future recoveries available to offset maximum amount of future payments under credit default swaps   16 27  
Excess securities collateral provided on derivatives   226 272  
Change in fair value of derivatives excluded from the assessment of hedge effectiveness   (58) (40) (23)
Ba [Member]        
Derivatives, Fair Value [Line Items]        
Maximum Amount of Future Payments under Credit Default Swaps   15 115  
Estimated Fair Value of Credit Default Swaps   $ 0 $ 1  
Derivative Instruments, Gain (Loss) [Line Items]        
Derivative, Average Remaining Maturity   1 year 12 months 3 years 5 months  
Nonperformance Risk [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Embedded derivative gains (losses)   $ 133 $ (190) 156
Over the Counter [Member]        
Derivatives, Fair Value [Line Items]        
Derivative Asset, Collateral, Obligation to Return Cash, Offset   4,709 4,169  
Excess securities collateral received on derivatives   (70) (108)  
Excess securities collateral provided on derivatives   (212) (305)  
Exchange Cleared [Member]        
Derivatives, Fair Value [Line Items]        
Derivative Asset, Collateral, Obligation to Return Cash, Offset   145 584  
Excess securities collateral provided on derivatives   (601) (522)  
Exchange Traded [Member]        
Derivatives, Fair Value [Line Items]        
Derivative Asset, Collateral, Obligation to Return Cash, Offset   0 0  
Excess securities collateral provided on derivatives   (90) (89)  
Cash Flow Hedging [Member] | Discontinued Operations [Member] | Brighthouse Financial, Inc        
Derivative Instruments, Gain (Loss) [Line Items]        
Reduction of Deferred Gains within AOCI $ 414   (92) $ 71
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   $ 99 $ 75  
Estimated Fair Value Liabilities   $ (59) $ (49)