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Employee Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
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 | 1 |  | 57
﻿December 31, 2018 |  | 1,145,627 |  |  | 62
﻿ |  | 25,643,253 |  | $ | 623
| (1) |  | Stock Incentive Plan number of granted restricted stock units related to 2017 was adjusted by 23,082 additional restricted stock units during the year ended December 31, 2018.
2007 Stock Incentive Plan, ROI Summary | ﻿ ﻿
﻿ |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |
﻿ |  |  |  | Intrinsic Value |  |
﻿ |  |  |  | of SIP Shares |  |
﻿ |  | Stock |  | which Vested |  | ROI Unit
﻿ |  | Incentive Plan |  | and were Distributed |  | Stock Plan
﻿ |  | Units |  | ($ millions) 1 |  | Shares
﻿Balance, December 31, 2015 |  | 8,937,985 |  |  |  |  | 6,370
﻿Granted |  | 1,451,136 |  |  |  |  | —
﻿Cancelled |  | (69,340) |  |  |  |  | —
﻿Distributed |  | (2,402,062) |  | $ | 88 |  | (1,376)
﻿Balance, December 31, 2016 |  | 7,917,719 |  |  |  |  | 4,994
﻿Granted |  | 946,489 | 2 |  |  |  | —
﻿Cancelled |  | (115,711) |  |  |  |  | —
﻿Distributed |  | (2,274,777) |  | $ | 81 |  | (1,145)
﻿Balance, December 31, 2017 |  | 6,473,720 |  |  |  |  | 3,849
﻿Granted |  | 1,145,627 |  |  |  |  | —
﻿Cancelled |  | (63,657) |  |  |  |  | —
﻿Distributed |  | (2,083,624) |  | $ | 164 |  | (3,849)
﻿Balance, December 31, 2018 |  | 5,472,066 |  |  |  |  | —
﻿ ﻿
| (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 2017 was adjusted by 23,082 additional restricted stock units during the year ended December 31, 2018.
﻿

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