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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Derivative, Credit Risk Related Contingent Features [Abstract]          
Derivative, Net Liability Position, Aggregate Fair Value $ 185   $ 185   $ 284
Collateral Already Posted, Aggregate Fair Value 170   170   283
Additional Collateral, Aggregate Fair Value 15   15   $ 1
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     4    
Cash flow hedge gain to be reclassified within twelve months to interest and debt expense     (1)    
Cash flow hedge loss to be reclassified within twelve months recorded in net investment income     $ 5    
Longest period of time over which the entity hedges exposure to the variability in future cash flows     20 years    
Net investment hedges [Member]          
Derivative Instruments, Gain (Loss)          
Gain on net investment hedge 6   $ 25    
Interest rate contracts [Member] | Interest and debt expense [Member] | Fair value hedges [Member]          
Derivative Instruments, Gain (Loss)          
Amount of gain recognized in income on derivatives $ 5 $ 8 $ 15 $ 24