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Stock-Based Compensation Incentive Equity Awards Activity - Summary of Option Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2016 | Jun. 30, 2015
Options, Weighted Average Exercise Price Roll Forward |  |  |
Proceeds from exercise of stock options |  | $ 1 | $ 2
Options |  |  |
Options, Number of Shares Roll Forward |  |  |
Outstanding at January 1, 2016 |  | 3,150 |
Granted |  | 300 |
Exercised (a) (b) | [1],[2] | (50) |
Forfeited/Expired |  | (20) |
Outstanding at June 30, 2016 (c) | [3] | 3,380 |
Options, Weighted Average Exercise Price Roll Forward |  |  |
Outstanding at January 1, 2016 |  | $ 31.42 |
Granted |  | 32.63 |
Exercised (a) (b) | [1],[2] | 20.82 |
Forfeited/Expired |  | 33.42 |
Outstanding at June 30, 2016 (c) | [3] | $ 31.68 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value |  | $ 1 |
Proceeds from exercise of stock options |  | 1 |
Intrinsic value of outstanding options |  | $ 13 |
Weighted average remaining contractual life of outstanding options |  | 6 years 5 months |
[1] | Cash received from options exercised during the six months ended June 30, 2016 was $1 million.
[2] | The intrinsic value of options exercised during the six months ended June 30, 2016 was $1 million.
[3] | Options outstanding at June 30, 2016 have an intrinsic value of $13 million and have a weighted average remaining contractual life of 6.4 years.

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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 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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