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Employee Incentive Plans (Share Grants And Fair Value) (Details) - USD ($)
$ in Millions
 12 Months Ended 92 Months Ended 128 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2017
Employee Incentive Plans [Abstract]          
Shares granted 946,489 [1] 1,451,136 1,211,533 20,888,468  
Fair Value - Date of Grant $ 57 $ 55 $ 52 $ 397 $ 57
Shares Granted IPO to Date         24,497,626
Fair Value - Date of Grant IPO to Date         $ 561
[1] Stock Incentive Plan number of granted restricted stock units related to 2017 was adjusted by 23,082 additional restricted stock units during the six months ended June 30, 2018.