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Derivatives and Hedging Activities (Impact of Hedging Activity) (Details 4) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Derivative Instruments, Gain (Loss)          
Cash flow hedge loss to be reclassified within twelve months recorded in net investment income     $ 0    
Derivative, Credit Risk Related Contingent Features [Abstract]          
Aggregate fair value of derivative contracts in a net liability position containing such credit contingent instruments $ 483   483   $ 372
Aggregate fair value of assets posted as collateral for such instruments 482   482   369
Aggregate fair value of additional assets required to be posted or needed to settle the instruments 1   1   $ 3
Cash flow hedges [Member]          
Derivative Instruments, Gain (Loss)          
Estimated reclassification of net pretax losses on cash flow hedges from accumulated other comprehensive income to earnings during the next 12 months     1    
Cash flow hedge gain to be reclassified within twelve months to interest and debt expense     $ 1    
Longest period of time over which the entity hedges exposure to the variability in future cash flows     17 years    
Net investment hedges [Member]          
Derivative Instruments, Gain (Loss)          
Gain (loss) on net investment hedge 7 $ (4) $ 13 $ (3)  
Interest rate contracts [Member] | Interest and debt expense [Member] | Fair value hedges [Member]          
Derivative Instruments, Gain (Loss)          
Amount of gain on fair value hedges recognized in income on derivatives $ 3 $ 4 $ 9 $ 12