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Retirement Plans and Profit Sharing Arrangements (Threadneedle Profit Sharing Plan) (Details 9) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Profit sharing plan [Member]      
Defined Benefit, Threadneedle Profit Sharing Plan [Abstract]      
Compensation expense (benefit) related to the employee profit sharing plan $ 49 $ 60 $ 66