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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Loss
Treasury Stock, at Cost
Non-controlling Interests
Balance, value at Dec. 31, 2015 $ 4,713 $ 2 $ 2,481 $ 6,199 $ (38) $ (3,960) $ 29
Balance, shares at Dec. 31, 2015   143.0          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 523     490     33
Other comprehensive income (loss), net of taxes (23)       (23)    
Dividends declared (169)     (169)      
Distributions to noncontrolling interests (31)           (31)
Issuance of common stock under benefit plans, value 16   5     11  
Issuance of common stock under benefit plans, shares   1.0          
Stock-based compensation expense 52   49     3  
Exercise of stock options, value 63   1     62  
Exercise of stock options, shares   1.0          
Shares to cover employee payroll tax withholdings on stock issued under stock-based compensation plans (10)   (10)        
Purchases of treasury stock, value (440)   0     $ (440)  
Purchases of treasury stock, shares   (6.0)       (5.7)  
Balance, value at Sep. 30, 2016 4,694 $ 2 2,526 6,520 (61) $ (4,324) 31
Balance, shares at Sep. 30, 2016   139.0          
Balance, Value at Dec. 31, 2015 70            
Redeemable Non-controlling Interest [Abstract]              
Net income 6            
Balance, Value at Sep. 30, 2016 76            
Balance, value at Dec. 31, 2016 4,660 $ 2 2,545 6,613 (72) (4,460) 32
Balance, shares at Dec. 31, 2016   137.0          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 552     518     34
Other comprehensive income (loss), net of taxes 24       24    
Dividends declared (185)     (185)      
Distributions to noncontrolling interests (34)           (34)
Issuance of common stock under benefit plans, value 18   9     9  
Stock-based compensation expense 54   51     3  
Exercise of stock options, value 125   3     122  
Exercise of stock options, shares   3.0          
Shares to cover employee payroll tax withholdings on stock issued under stock-based compensation plans (23)   (23)        
Purchases of treasury stock, value (365)         $ (365)  
Purchases of treasury stock, shares   (4.0)       (3.6)  
Other 2           2
Balance, value at Sep. 30, 2017 4,828 $ 2 $ 2,585 $ 6,946 $ (48) $ (4,691) $ 34
Balance, shares at Sep. 30, 2017   136.0          
Balance, Value at Dec. 31, 2016 77            
Redeemable Non-controlling Interest [Abstract]              
Net income 5            
Distributions to noncontrolling interests (4)            
Balance, Value at Sep. 30, 2017 $ 78