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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.

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- Definition Fair Value of all shares granted under the 2007 Stock Incentive Plan from the IPO to date. + References No definition available. + Details
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