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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
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.