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Employee Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Employee Incentive Plans [Abstract] |
Share Grants And Fair Value |
﻿ |  |  |  |  |
﻿ |  |  |  |  |
﻿ |  |  |  | Fair Value at
﻿ |  |  |  | Date of Grant
﻿ |  | Units |  | ($ millions)
﻿Prior periods (since inception) |  | 20,888,468 |  | $ | 397
﻿December 31, 2015 |  | 1,211,533 |  |  | 52
﻿December 31, 2016 |  | 1,451,136 | 1 |  | 55
﻿December 31, 2017 |  | 923,407 | 2 |  | 55
﻿ |  | 24,474,544 |  | $ | 559
| (1) |  | Stock Incentive Plan number of granted restricted stock units related to 2016 was adjusted by 5,657 additional restricted stock units during the year ended December 31, 2017.
| (2) |  | Granted under the Company’s amended 2007 Stock Incentive Plan, pending stockholder approval at the Company’s 2018 Annual Meeting.
2007 Stock Incentive Plan, ROI Summary |
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  | Intrinsic Value |  |  |
﻿ |  |  |  | of SIP Units |  |  |
﻿ |  | Stock |  | which Vested |  | ROI Unit |
﻿ |  | Incentive Plan |  | and were Distributed |  | Stock Plan |
﻿ |  | Units |  | ($ millions) (1) |  | Shares |
﻿Balance, December 31, 2014 |  | 10,376,800 |  |  |  |  | 9,614 |
﻿Granted |  | 1,211,533 |  |  |  |  | — |
﻿Cancelled |  | (163,221) |  |  |  |  | — |
﻿Distributed |  | (2,487,127) |  | $ | 86 |  | (3,244) |
﻿Balance, December 31, 2015 |  | 8,937,985 |  |  |  |  | 6,370 |
﻿Granted |  | 1,451,136 | (2) |  |  |  | — |
﻿Cancelled |  | (69,340) |  |  |  |  | — |
﻿Distributed |  | (2,402,062) |  | $ | 88 |  | (1,376) |
﻿Balance, December 31, 2016 |  | 7,917,719 |  |  |  |  | 4,994 |
﻿Granted |  | 923,407 | (3) |  |  |  | — |
﻿Cancelled |  | (115,711) |  |  |  |  | — |
﻿Distributed |  | (2,274,777) |  | $ | 81 |  | (1,145) |
﻿Balance, December 31, 2017 |  | 6,450,638 |  |  |  |  | 3,849 |
﻿
| (1) |  | Intrinsic value of SIP unit s distributed represents the compensation value reported to the participants.
| (2) |  | Stock Incentive Plan number of granted restricted stock units related to 2016 was adjusted by 5,657 additional restricted stock units during the year ended December 31, 2017.
| (3) |  | Granted under the Company’s amended 2007 Stock Incentive Plan, pending stockholder approval at the Company’s 2018 Annual Meeting.

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