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Employee Incentive Plans (Tables) | 3 Months Ended
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Mar. 31, 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 |  | 1,227,433 | 1 |  | 70
|  | 28,245,543 |  | $ | 758
______________________________ (1)Stock Incentive Plan number of granted restricted stock units related to 2020 was adjusted by 5,290 additional restricted stock units during the three months ended March 31, 2021.
2007 Stock Incentive Plan, ROI Summary |
|  | Stock |
|  | Incentive Plan |
|  | Units |
Balance, December 31, 2020 1 |  | 4,972,611 |
Granted |  | — |
Cancelled |  | (12,345) |
Distributed |  | — |
Balance, March 31, 2021 |  | 4,960,266 |
_____________________________ (1)Stock Incentive Plan number of granted restricted stock units related to 2020 was adjusted by 5,290 additional restricted stock units during the three months ended March 31, 2021.

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