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Employee Incentive Plans (Share Grants And Fair Value) (Details) - USD ($)
$ in Millions
 12 Months Ended 116 Months Ended 152 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2019
Employee Incentive Plans [Abstract]          
Shares granted 1,374,560 1,146,267 [1] 946,489 23,551,137  
Fair Value - Date of Grant $ 65 $ 62 $ 57 $ 504 $ 65
Shares Granted IPO to Date         27,018,453
Fair Value - Date of Grant IPO to Date         $ 688
[1] Stock Incentive Plan number of granted restricted stock units related to 2018 was adjusted by 640 additional restricted stock units during the year ended December 31, 2019.