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Employee Incentive Plans (Share Grants And Fair Value) (Details) - USD ($)
$ in Millions
 12 Months Ended 104 Months Ended 140 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2018
Employee Incentive Plans [Abstract]          
Shares granted 1,146,267 [1] 946,489 1,451,136 22,100,001  
Fair Value - Date of Grant $ 62 $ 57 $ 55 $ 449 $ 62
Shares Granted IPO to Date         25,643,893
Fair Value - Date of Grant IPO to Date         $ 623
[1] Stock Incentive Plan number of granted restricted stock units related to 2018 was adjusted by 640 additional restricted stock units during the three months ended March 31, 2019.