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Employee Incentive Plans (Share Grants And Fair Value) (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended 116 Months Ended 152 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2019
Employee Incentive Plans [Abstract]            
Shares granted   1,374,217 [1] 1,146,267 946,489 23,551,137  
Fair Value - Date of Grant   $ 65 $ 62 $ 57 $ 504 $ 65
Shares Granted IPO to Date           27,018,110
Fair Value - Date of Grant IPO to Date           $ 688
Stock Incentive Plan Granted Shares Adjustment 343          
[1] Stock Incentive Plan number of granted restricted stock units related to 2019 was adjusted by 343 additional restricted stock units during the nine months ended September 30, 2020.