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Stock-Based Compensation Incentive Equity Awards Activity - Summary of Option Activity (Details) - USD ($) $ / shares in Units, $ in Millions | 9 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014
Options, Weighted Average Exercise Price Roll Forward |  |  |
Intrinsic value of options exercised |  | $ 4 |
Proceeds from exercise of stock options |  | 3 | $ 2
Intrinsic value of outstanding options |  | $ 34 |
Weighted average remaining contractual life of outstanding options |  | 6 years 10 months 23 days |
Options |  |  |
Options, Number of Shares Roll Forward |  |  |
Outstanding at January 1, 2015 |  | 3,220,000.00 |
Granted |  | 180,000.00 |
Exercised (a) (b) | [1],[2] | (160,000.00) |
Forfeited/Expired |  | (30,000.00) |
Outstanding at September 30, 2015 (c) | [3] | 3,210,000.00 |
Options, Weighted Average Exercise Price Roll Forward |  |  |
Outstanding at January 1, 2015 |  | $ 30.02 |
Granted |  | 46.45 |
Exercised (a) (b) | [1],[2] | 21.31 |
Forfeited/Expired |  | 34.33 |
Outstanding at September 30, 2015 (c) | [3] | $ 31.31 |
[1] | Cash received from options exercised during the nine months ended September 30, 2015 was $3 million.
[2] | The intrinsic value of options exercised during the nine months ended September 30, 2015 was $4 million.
[3] | Options outstanding at September 30, 2015 have an intrinsic value of $34 million and have a weighted average remaining contractual life of 6.9 years.

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