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Derivatives and Hedging Activities (Impact of Hedging Activity) (Details 4) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Derivative, Credit Risk Related Contingent Features [Abstract]      
Aggregate fair value of derivative contracts in a net liability position containing such credit contingent instruments $ 345   $ 372
Aggregate fair value of assets posted as collateral for such instruments 341   369
Aggregate fair value of additional assets required to be posted or needed to settle the instruments 4   $ 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 2    
Cash flow hedge loss to be reclassified within twelve months recorded in net investment income $ (1)    
Longest period of time over which the entity hedges exposure to the variability in future cash flows 18 years    
Net investment hedges [Member]      
Derivative Instruments, Gain (Loss)      
Gain (loss) on net investment hedge $ 7 $ 2  
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 $ 4 $ 4