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Employee Incentive Plans (Tables) | 9 Months Ended
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Sep. 30, 2021
Employee Incentive Plans [Abstract] |
Share Grants And Fair Value |
|  |  |  | Fair Value at
|  |  |  | Date of Grant
|  | Units |  | ($ millions)
Prior periods (since inception) |  | 24,497,626 |  | $ | 561
December 31, 2018 |  | 1,146,267 |  |  | 62
December 31, 2019 |  | 1,374,217 |  |  | 65
December 31, 2020 |  | 1,229,177 | 1 |  | 71
|  | 28,247,287 |  | $ | 759
______________________________ (1)Stock Incentive Plan number of granted restricted stock units related to 2020 was adjusted by 7,034 additional restricted stock units during the nine months ended September 30, 2021.
2007 Stock Incentive Plan, ROI Summary |
|  | Stock
|  | Incentive Plan
|  | Units
Balance, December 31, 2020 1 |  | 4,974,355
Granted |  | —
Canceled |  | (40,495)
Distributed |  | (1,215,965)
Balance, September 30, 2021 |  | 3,717,895
_____________________________ (1)Stock Incentive Plan number of granted restricted stock units related to 2020 was adjusted by 7,034 additional restricted stock units during the nine months ended September 30, 2021.

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