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Employee Incentive Plans (Share Grants And Fair Value) (Details) - USD ($)
$ in Millions
 12 Months Ended 68 Months Ended 113 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2016
Employee Incentive Plans [Abstract]          
Shares granted 1,211,533 [1] 1,709,968 1,894,046 17,284,454  
Fair Value - Date of Grant $ 52 $ 49 $ 46 $ 302  
Shares Granted IPO to Date         22,100,001
Fair Value - Date of Grant IPO to Date         $ 449
[1] Stock Incentive Plan number of granted shares related to 2015 was adjusted by 12,454 additional shares during the nine months ended September, 30, 2016.