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Employee Incentive Plans (Tables) | 6 Months Ended
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Jun. 30, 2017
Employee Incentive Plans [Abstract] |
Share Grants And Fair Value |
﻿ |  |  |  |  |
﻿ |  |  |  |  |
﻿ |  |  |  | Fair Value at
﻿ |  |  |  | Date of Grant
﻿ |  | Shares |  | ($ millions)
﻿Prior periods (since inception) |  | 19,178,500 |  | $ | 348
﻿December 31, 2014 |  | 1,709,968 |  |  | 49
﻿December 31, 2015 |  | 1,211,533 |  |  | 52
﻿December 31, 2016 |  | 1,451,136 | 1 |  | 55
﻿ |  | 23,551,137 |  | $ | 504
﻿
| (1) |  | Stock Incentive Plan number of granted shares related to 2016 was adjusted by 5,657 additional shares during the six months ended June 30, 201 7.
2007 Stock Incentive Plan, ROI Summary |
﻿ |  |  |  |  |
﻿ |  |  |  |  |
﻿ |  | Stock |  |  | ROI Unit
﻿ |  | Incentive Plan |  |  | Stock Plan
﻿ |  | Shares |  |  | Shares
﻿Balance, December 31, 2016 |  | 7,917,719 | 1 |  | 4,994
﻿Granted |  | — |  |  | —
﻿Cancelled |  | (44,791) |  |  | —
﻿Distributed |  | (2,265,002) |  |  | (1,059)
﻿Balance, June 30, 2017 |  | 5,607,926 |  |  | 3,935
﻿ ﻿
| (1) |  | Stock Incentive Plan number of granted shares related to 2016 was adjusted by 5,657 additional shares during the six months ended June 30, 2017.

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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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- Definition Tabular disclosure of the weighted-average grant-date fair value of equity options or other equity instruments granted during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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