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Employee Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2022
Employee Incentive Plans [Abstract] |
Share Grants And Fair Value |
|  |  |  | Fair Value at
|  |  |  | Date of Grant
|  | Units |  | ($ millions)
Prior periods (since inception) |  | 27,018,110 |  | $ | 687
December 31, 2020 |  | 1,229,177 |  |  | 71
December 31, 2021 |  | 1,084,773 | 1 |  | 84
April 25, 2022 |  | 180,889 | 2 |  | 12
December 31, 2022 |  | 1,244,383 |  |  | 91
|  | 30,757,332 |  | $ | 945
___________________________ (1)Stock Incentive Plan number of granted restricted stock units related to 2021 was adjusted by 7,725 additional restricted stock units during the year ended December 31, 2022. (2)On April 25, 2022, the Company awarded a special grant of restricted stock units to employees.
2007 Stock Incentive Plan, ROI Summary | .
|  |  |  | Intrinsic Value
|  |  |  | of SIP Shares
|  | Stock |  | which Vested and
|  | Incentive Plan |  | were Distributed
|  | Units |  | ($ millions) 1
Balance, December 31, 2019 |  | 5,127,915 |  |  |
Granted |  | 1,229,177 |  |  |
Canceled |  | (82,496) |  |  |
Distributed |  | (1,300,241) |  | $ | 53
Balance, December 31, 2020 |  | 4,974,355 |  |  |
Granted |  | 1,084,773 | 2 |  |
Canceled |  | (55,177) |  |  |
Distributed |  | (1,220,141) |  | $ | 85
Balance, December 31, 2021 |  | 4,783,810 |  |  |
Granted |  | 1,425,272 |  |  |
Canceled |  | (179,856) |  |  |
Distributed |  | (1,276,186) |  | $ | 67
Balance, December 31, 2022 |  | 4,753,040 |  |  |
___________________________ (1)Intrinsic value of SIP units distributed represents the compensation value reported to the participants. (2)Stock Incentive Plan number of granted restricted stock units related to 2021 was adjusted by 7,725 additional restricted stock units during the year ended December 31, 2022.

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