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Note 12. Stock-Based Compensation Incentive Equity Awards Activity - Summary of Share-Based Compensation Activity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Options, Weighted Average Exercise Price Roll Forward |  |  |  |  |
Proceeds from exercise of stock options |  | $ 8 |  | $ 2 | $ 5
Restricted Stock Units |  |  |  |  |
Equity Instruments Other than Options, Number of Shares Roll Forward |  |  |  |  |
Outstanding at January 1, 2017 |  | 1.5 |  |  |
Granted |  | 1.2 |  |  |
Distributed/Exercised | [1] | (0.6) |  |  |
Forfeited/Expired |  | (0.1) |  |  |
Outstanding at December 31, 2017 |  | 2.0 |  | 1.5 |
Equity Instruments Other than Options, Weighted Average Grant Date Fair Value Roll Forward |  |  |  |  |
Outstanding at January 1, 2017 |  | $ 37.72 |  |  |
Granted |  | 28.61 |  |  |
Distributed/Exercised |  | 39.64 |  |  |
Forfeited/Expired |  | 30.90 |  |  |
Outstanding at December 31, 2017 |  | $ 31.71 |  | $ 37.72 |
Options, Weighted Average Exercise Price Roll Forward |  |  |  |  |
Fair Value of Shares Distributed in Period |  | $ 26 |  |  |
Performance Share Units |  |  |  |  |
Equity Instruments Other than Options, Number of Shares Roll Forward |  |  |  |  |
Outstanding at January 1, 2017 | [2] | 1.4 |  |  |
Granted | [2] | 0.7 |  |  |
Distributed/Exercised | [2],[3] | (0.3) |  |  |
Forfeited/Expired | [2] | 0.0 |  |  |
Outstanding at December 31, 2017 | [2] | 1.8 |  | 1.4 |
Equity Instruments Other than Options, Weighted Average Grant Date Fair Value Roll Forward |  |  |  |  |
Outstanding at January 1, 2017 |  | $ 38.31 |  |  |
Granted |  | 27.70 |  |  |
Distributed/Exercised |  | 42.30 |  |  |
Forfeited/Expired |  | 0.00 |  |  |
Outstanding at December 31, 2017 |  | $ 33.16 |  | $ 38.31 |
Options, Weighted Average Exercise Price Roll Forward |  |  |  |  |
Fair Value of Shares Distributed in Period |  | $ 14 |  |  |
Fair Value of Shares Vested in Period |  | $ 9 |  | $ 10 |
Shares Vested in Period |  | 0.2 |  |  |
Weighted Average Fair Value of Shares Vested in Period |  | $ 46.46 |  |  |
Options |  |  |  |  |
Options, Number of Shares Roll Forward |  |  |  |  |
Outstanding at January 1, 2017 | [4] | 3.3 |  |  |
Granted | [4] | 0.7 |  |  |
Distributed/Exercised | [4],[5] | (0.3) |  |  |
Forfeited/Expired | [4] | (0.1) |  |  |
Outstanding at December 31, 2017 | [4] | 3.6 | [6] | 3.3 |
Options, Weighted Average Exercise Price Roll Forward |  |  |  |  |
Outstanding at January 1, 2017 |  | $ 31.69 |  |  |
Granted |  | 29.60 |  |  |
Distributed/Exercised |  | 23.29 |  |  |
Forfeited/Expired |  | 50.24 |  |  |
Outstanding at December 31, 2017 |  | $ 31.75 |  | $ 31.69 |
Intrinsic Value of Options Exercised |  | $ 2 |  |  |
Proceeds from exercise of stock options |  | 8 |  |  |
Intrinsic Value of Outstanding Options |  | $ 6 |  |  |
Weighted Average Remaining Contractual Life of Outstanding Options |  | 5 years 9 months |  |  |
[1] | (b)The total fair value of RSUs which were distributed during the year ended December 31, 2017 was $26 million.
[2] | (a)The PSU amounts in the table are shown at the target amount of the award.
[3] | (c)The total fair value of PSUs which were distributed during the year ended December 31, 2017 was $14 million, which includes the distribution of PSUs awarded in 2014, measuring performance over a three-year performance period ended December 31, 2016, at a fair value of $10 million. Amounts distributed do not include 0.2 million PSUs awarded in 2015, measuring performance over a three-year period ended and vested December 31, 2017, at a fair value of $9 million and at a weighted average grant date fair value of $46.46. These PSUs were distributed in early 2018.
[4] | (f)The following table summarizes information regarding exercisable stock options as of December 31, 2017:Range of Exercise Prices Options Vested Weighted Average Exercise Price Aggregate Intrinsic Value Weighted Average Remaining Contractual Life$15.00 to $50.00 2.4 $27.86 $6.3 4.7 years$50.01 and above 0.1 $140.26 $— 2.8 years
[5] | (d)The intrinsic value of options exercised during the year ended December 31, 2017 was $2 million. Cash received from options exercised during the year ended December 31, 2017 was $8 million.
[6] | (e)Options outstanding at December 31, 2017 have an intrinsic value of $6 million and have a weighted average remaining contractual life of 5.8 years.

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