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Employee Benefit Plans (Summary of Compensation Expense and Tax Benefit) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]      
Compensation cost $ 156 $ 144 $ 134
Tax benefit $ (59) $ (54) $ (50)