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Derivatives and Hedging Activities (Impact of Hedging Activity) (Details 4) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivatives liabilities, credit risk related contingent features      
Aggregate fair value of all derivative instruments containing credit risk features $ 372 $ 254  
Aggregate fair value of assets posted as collateral 369 246  
Additional collateral required to be posted 3 8  
Cash flow hedges [Member]      
Derivative Instruments, Gain (Loss)      
Gain on cash flow hedge ineffectiveness 1 0 $ 1
Estimated reclassification of net pretax losses on cash flow hedges from accumulated other comprehensive income to earnings during the next 12 months 0    
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 $ (2)    
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 recorded in OCI $ 4 34  
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 $ 16 $ 19 $ 31