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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, 2018
Dec. 31, 2017
Restricted Stock Units    
Equity Instruments Other than Options, Number of Shares Roll Forward    
Outstanding at January 1, 2018 2.0  
Granted 1.5  
Distributed/Exercised [1] (0.9)  
Forfeited/Expired (0.1)  
Outstanding at December 31, 2018 2.5 2.0
Equity Instruments Other than Options, Weighted Average Grant Date Fair Value Roll Forward    
Outstanding at January 1, 2018 $ 31.71  
Granted 25.39  
Distributed/Exercised 33.67  
Forfeited/Expired 27.80  
Outstanding at December 31, 2018 $ 27.32 $ 31.71
Options, Weighted Average Exercise Price Roll Forward    
Fair Value of Shares Distributed in Period $ 30  
Performance Share Units    
Equity Instruments Other than Options, Number of Shares Roll Forward    
Outstanding at January 1, 2018 [2] 1.8  
Granted [2] 0.5  
Distributed/Exercised [2],[3] 0.4  
Forfeited/Expired [2] (0.1)  
Outstanding at December 31, 2018 [2] 1.8 1.8
Equity Instruments Other than Options, Weighted Average Grant Date Fair Value Roll Forward    
Outstanding at January 1, 2018 $ 33.16  
Granted 25.11  
Distributed/Exercised 42.14  
Forfeited/Expired 27.99  
Outstanding at December 31, 2018 $ 28.13 $ 33.16
Options, Weighted Average Exercise Price Roll Forward    
Fair Value of Shares Distributed in Period $ 15  
Fair Value of Shares Vested in Period $ 5 $ 9
Shares Vested in Period 0.2  
Weighted Average Fair Value of Shares Vested in Period $ 34.00  
Options    
Options, Number of Shares Roll Forward    
Outstanding at January 1, 2018 [4] 3.6  
Granted [4] 0.4  
Distributed/Exercised [4] 0.0  
Forfeited/Expired [4] (0.2)  
Outstanding at December 31, 2018 [4] 3.8 [5] 3.6
Options, Weighted Average Exercise Price Roll Forward    
Outstanding at January 1, 2018 $ 31.75  
Granted 25.35  
Distributed/Exercised 0.00  
Forfeited/Expired 38.28  
Outstanding at December 31, 2018 $ 30.92 $ 31.75
Intrinsic Value of Outstanding Options $ 0  
Weighted Average Remaining Contractual Life of Outstanding Options 5 years 4 months  
[1] (b)The total fair value of RSUs which were distributed during the year ended December 31, 2018 was $30 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, 2018 was $15 million, which includes the distribution of PSUs awarded in 2015 subject to performance over the three-year performance period ended December 31, 2017, at a fair value of $9 million. Amounts distributed do not include 0.2 million PSUs awarded in 2016 subject to achievement against performance over the three-year period ended and vested December 31, 2018, at a fair value of $5 million and at a weighted average grant date fair value of $34.00. These PSUs were distributed in early 2019.
[4] (e)The following table summarizes information regarding exercisable stock options as of December 31, 2018:Range of Exercise Prices Options Vested Weighted Average Exercise Price Aggregate Intrinsic Value Weighted Average Remaining Contractual Life$15.00 to $50.00 2.6 $28.82 $— 4.1 years$50.01 and above 0.1 $137.50 $— 1.9 years
[5] (d)Options outstanding at December 31, 2018 have an intrinsic value of zero and have a weighted average remaining contractual life of 5.3 years.