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Derivatives and Hedging Activities (Impact of Hedging Activity) (Details 4) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 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 $ 374   $ 374   $ 372
Aggregate fair value of assets posted as collateral for such instruments 370   370   369
Aggregate fair value of additional assets required to be posted or needed to settle the instruments 4   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 13 $ (1) $ 6 $ 1  
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 $ 2 $ 4 $ 6 $ 8