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Employee Incentive Plans (Tables) | 9 Months Ended
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Sep. 30, 2020
Employee Incentive Plans [Abstract] |
Share Grants And Fair Value |
|  |  |  | Fair Value at
|  |  |  | Date of Grant
|  | Units |  | ($ millions)
Prior periods (since inception) |  | 23,551,137 |  | $ | 504
December 31, 2017 |  | 946,489 |  |  | 57
December 31, 2018 |  | 1,146,267 |  |  | 62
December 31, 2019 |  | 1,374,217 | 1 |  | 65
|  | 27,018,110 |  | $ | 688
______________________________ (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.
2007 Stock Incentive Plan, ROI Summary |
|  | Stock
|  | Incentive Plan
|  | Units
Balance, December 31, 2019 1 |  | 5,127,915
Granted |  | —
Cancelled |  | (72,439)
Distributed |  | (1,298,027)
Balance, September 30, 2020 |  | 3,757,449
_____________________________ (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.

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