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Note 12. Stock-Based Compensation Incentive Equity Awards Activity - Summary of Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Options, Weighted Average Exercise Price Roll Forward      
Proceeds from exercise of stock options $ 2 $ 5 $ 6
Options      
Options, Number of Shares Roll Forward      
Outstanding at January 1, 2016 3,200    
Granted 300    
Exercised (a) (b) [1],[2] (100)    
Forfeited/Expired (100)    
Outstanding at December 31, 2016 (c) 3,300 [3] 3,200  
Options, Weighted Average Exercise Price Roll Forward      
Outstanding at January 1, 2016 $ 31.42    
Granted 32.33    
Exercised (a) (b) [1],[2] 19.86    
Forfeited/Expired 36.76    
Outstanding at December 31, 2016 (c) $ 31.73 [3] $ 31.42  
Intrinsic value of options exercised $ 1    
Proceeds from exercise of stock options 2    
Intrinsic value of outstanding options $ 7    
Weighted average remaining contractual life of outstanding options 5 years 12 months    
[1] (a)The intrinsic value of options exercised during the year ended December 31, 2016 was $1 million.
[2] (b)Cash received from options exercised during the year ended December 31, 2016 was $2 million.
[3] (c)Options outstanding at December 31, 2016 have an intrinsic value of $7 million and have a weighted average remaining contractual life of 6 years.