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Employee Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
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 | 1 |  | 62
December 31, 2019 |  | 1,374,560 |  |  | 65
|  | 27,018,453 |  | $ | 688
___________________________ (1)Stock Incentive Plan number of granted restricted stock units related to 2018 was adjusted by 640 additional restricted stock units during the year ended December 31, 2019.
2007 Stock Incentive Plan, ROI Summary | .
|  |  |  | Intrinsic Value |  |
|  |  |  | of SIP Shares |  |
|  | Stock |  | which Vested and |  | ROI Unit
|  | Incentive Plan |  | were Distributed |  | Stock Plan
|  | Units |  | ($ millions) 1 |  | Shares
Balance, December 31, 2016 |  | 7,917,719 |  |  |  |  | 4,994
Granted |  | 946,489 |  |  |  |  | —
Cancelled |  | (115,711) |  |  |  |  | —
Distributed |  | (2,274,777) |  | $ | 81 |  | (1,145)
Balance, December 31, 2017 |  | 6,473,720 |  |  |  |  | 3,849
Granted |  | 1,146,267 | 2 |  |  |  | —
Cancelled |  | (63,657) |  |  |  |  | —
Distributed |  | (2,083,624) |  | $ | 164 |  | (3,849)
Balance, December 31, 2018 |  | 5,472,706 |  |  |  |  | —
Granted |  | 1,374,560 |  |  |  |  | —
Cancelled |  | (91,443) |  |  |  |  | —
Distributed |  | (1,627,565) |  | $ | 91 |  | —
Balance, December 31, 2019 |  | 5,128,258 |  |  |  |  | —
___________________________ (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 2018 was adjusted by 640 additional restricted stock units during the year ended December 31, 2019.

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