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Derivatives (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Derivatives, Fair Value [Line Items]          
Maximum Amount of Future Payments under Credit Default Swaps $ 11,946   $ 11,946   $ 10,732
Estimated Fair Value of Credit Default Swaps 255   255   152
Estimated Fair Value Assets 8,792   8,792   12,139
Estimated Fair Value Liabilities 4,668   4,668   6,921
Excess securities collateral received on derivatives 284   284   $ 164
Derivative Instruments, Gain (Loss) [Line Items]          
Net derivatives gains (losses) 234 $ 277 421 $ (1,480)  
Derivative Instrument Detail [Abstract]          
Change in fair value of derivatives excluded from the assessment of hedge effectiveness (6) (6) (30) (16)  
Net amounts reclassified into net derivatives gains (losses) on discontinued cash flow hedges (4) 11 $ 16 6  
Hedging exposure to variability in future cash flows for specific length of time     5 years   5 years
Accumulated Other Comprehensive Income Loss 1,700   $ 1,700   $ 2,900
Deferred net gains (losses) expected to be reclassified to earnings     (81)    
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion) $ 0 $ 0 $ 0 $ 0  
Immateriality of cash flow effectiveness 0 0 0 0  
Cumulative foreign currency translation gain (loss) recorded in accumulated other comprehensive income (loss) for net investment in foreign operations hedges $ 359   $ 359   754
Potential future recoveries available to offset maximum amount of future payments under credit default swaps 441   441   30
Excess securities collateral provided on derivatives 281   281   461
Securities collateral received which the company is permitted to sell or repledge, amount that has been sold or repledged 0   0    
Nonperformance Risk [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Net derivatives gains (losses) (52) $ (154) (161) $ 738  
Over the Counter [Member]          
Derivatives, Fair Value [Line Items]          
Excess securities collateral received on derivatives (148)   (148)   (82)
Excess securities collateral provided on derivatives (364)   (364)   (189)
Cash collateral on derivative assets (4,351)   (4,351)   (4,244)
Exchange-traded          
Derivatives, Fair Value [Line Items]          
Excess securities collateral received on derivatives (440)   (440)   (544)
Excess securities collateral provided on derivatives (101)   (101)   (116)
Cash collateral on derivative assets 0   0   0
Cash Flow Hedging [Member] | Discontinued Operations [Member] | Brighthouse Financial, Inc          
Derivative Instrument Detail [Abstract]          
Reduction of Deferred Gains within AOCI 414 (16)   75  
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0 $ 8 16 $ 24  
Accrued Liabilities [Member]          
Derivatives, Fair Value [Line Items]          
Estimated Fair Value Assets 73   73   145
Estimated Fair Value Liabilities $ (43)   $ (43)   $ (43)