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Stock-Based Compensation Incentive Equity Awards Activity - Summary of Option Activity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016
Options, Weighted Average Exercise Price Roll Forward |  |  |
Proceeds from exercise of stock options |  | $ 3 | $ 1
Options |  |  |
Options, Number of Shares Roll Forward |  |  |
Outstanding at January 1, 2017 |  | 3.3 |
Granted |  | 0.4 |
Exercised (a) (b) | [1],[2] | (0.2) |
Forfeited/Expired |  | 0.0 |
Outstanding at June 30, 2017 (c) | [3] | 3.5 |
Options, Weighted Average Exercise Price Roll Forward |  |  |
Outstanding at January 1, 2017 |  | $ 31.71 |
Granted |  | 27.56 |
Exercised (a) (b) | [1],[2] | 23.89 |
Forfeited/Expired |  | 0.00 |
Outstanding at June 30, 2017 (c) | [3] | $ 31.50 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  | $ 1 |
Proceeds from exercise of stock options |  | 5 |
Intrinsic value of outstanding options |  | $ 6 |
Weighted average remaining contractual life of outstanding options |  | 6 years |
[1] | Cash received from options exercised during the six months ended June 30, 2017 was $5 million.
[2] | The intrinsic value of options exercised during the six months ended June 30, 2017 was $1 million.
[3] | Options outstanding at June 30, 2017 have an intrinsic value of $6 million and have a weighted average remaining contractual life of 6 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=96867065&loc=d3e5070-113901 + Details
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