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Derivatives and Hedging Activities (Impact of Hedging Activity) (Details 4) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Derivative, Credit Risk Related Contingent Features [Abstract]      
Derivative, Net Liability Position, Aggregate Fair Value $ 238   $ 284
Collateral Already Posted, Aggregate Fair Value 232   283
Additional Collateral, Aggregate Fair Value 6   $ 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 (2)    
Cash flow hedge loss to be reclassified within twelve months recorded in net investment income $ 6    
Longest period of time over which the entity hedges exposure to the variability in future cash flows 20 years    
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