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Employee Incentive Plans (Share Grants And Fair Value) (Details) - USD ($)
$ in Millions
 12 Months Ended 80 Months Ended 122 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2017
Employee Incentive Plans [Abstract]          
Shares granted 1,451,136 [1] 1,211,533 1,709,968 19,178,500  
Fair Value - Date of Grant $ 55 $ 52 $ 49 $ 348  
Shares Granted IPO to Date         23,551,137
Fair Value - Date of Grant IPO to Date         $ 504
[1] Stock Incentive Plan number of granted shares related to 2016 was adjusted by 5,657 additional shares during the six months ended June 30, 2017.