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Employee Incentive Plans (Tables) | 9 Months Ended
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Sep. 30, 2019
Employee Incentive Plans [Abstract] |
Share Grants And Fair Value |
|  |  |  | Fair Value at
|  |  |  | Date of Grant
|  | Units |  | ($ millions)
Prior periods (since inception) |  | 22,100,001 |  | $ | 449
December 31, 2016 |  | 1,451,136 |  |  | 55
December 31, 2017 |  | 946,489 |  |  | 57
December 31, 2018 |  | 1,146,267 | 1 |  | 62
|  | 25,643,893 |  | $ | 623
(1)Stock Incentive Plan number of granted restricted stock units related to 2018 was adjusted by 640 additional restricted stock units during the nine months ended September 30, 2019.
2007 Stock Incentive Plan, ROI Summary |
|  | Stock |
|  | Incentive Plan |
|  | Units |
Balance, December 31, 2018 |  | 5,472,706 | 1
Granted |  | — |
Cancelled |  | (71,829) |
Distributed |  | (1,626,825) |
Balance, September 30, 2019 |  | 3,774,052 |
(1)Stock Incentive Plan number of granted restricted stock units related to 2018 was adjusted by 640 additional restricted stock units during the nine months ended September 30, 2019.

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