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Stock-Based Plans - VDI Units (Details) - Performance-based VDI units - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
VDI units |  |  |
Vesting period | 3 years |  |
Post vesting holding period restriction | 3 years |  |
Unamortized compensation expense | $ 1 |  |
Performance-based liabilities paid during year | $ 26 |  |
Maximum |  |  |
VDI units |  |  |
Weighted average period of recognition of unamortized expense | 1 year |  |
Corporate general and administrative expense |  |  |
VDI units |  |  |
Recognized compensation expense | $ 8 | $ 8 | $ 11
Executives |  |  |
VDI units |  |  |
Granted (in shares) | 249,204 | 296,052 | 430,970
2017 VDI Plan | Executives |  |  |
VDI units |  |  |
Expected amount of shares granted (in shares) | 83,068 |  |
Expected weighted average grant date fair value (in dollars per share) | $ 53.35 |  |
2016 VDI Plan | Executives |  |  |
VDI units |  |  |
Expected amount of shares granted (in shares) |  | 92,094 |
Expected weighted average grant date fair value (in dollars per share) |  | $ 51.62 |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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