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Stock-Based Compensation Incentive Equity Awards Activity - Summary of Option Activity (Details) - Options $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended
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Mar. 31, 2017 USD ($) $ / shares shares
Options, Number of Shares Roll Forward |  |
Outstanding at January 1, 2017 | shares | 3.3 |
Granted | shares | 0.4 |
Exercised | shares | 0.0 |
Forfeited/Expired | shares | 0.0 |
Outstanding at March 31, 2017 (a) | shares | 3.7 | [1]
Options, Weighted Average Exercise Price Roll Forward |  |
Outstanding at January 1, 2017 | $ / shares | $ 31.73 |
Granted | $ / shares | 27.56 |
Exercised | $ / shares | 0.00 |
Forfeited/Expired | $ / shares | 0.00 |
Outstanding at March 31, 2017 (a) | $ / shares | $ 31.31 | [1]
Intrinsic value of outstanding options | $ | $ 7 |
Weighted average remaining contractual life of outstanding options | 6 years 2 months |
[1] | Options outstanding at March 31, 2017 have an intrinsic value of $7 million and have a weighted average remaining contractual life of 6.2 years.

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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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 (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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 (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + 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 (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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