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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, 2014 $ 4,330 $ 2 $ 2,418 $ 5,723 $ (27) $ (3,815) $ 29
Balance, shares at Dec. 31, 2014   144.0          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 199     179     20
Other comprehensive income (loss), net of taxes 2       2    
Dividends declared (109)     (109)      
Distributions to noncontrolling interests (19)           (19)
Issuance of common stock under benefit plans, value 11   4     7  
Issuance of common stock under benefit plans, shares   1.0          
Stock-based compensation expense 27   25     2  
Exercise of stock options, value 55         55  
Exercise of stock options, shares   1.0          
Shares to cover employee payroll tax withholdings on stock issued under stock-based compensation plans (6)   (6)        
Tax benefits associated with stock-based compensation plans 3   3        
Purchases of treasury stock, value (149)         $ (149)  
Purchases of treasury stock, shares   (2.0)       (2.1)  
Balance, value at Jun. 30, 2015 4,344 $ 2 2,444 5,793 (25) $ (3,900) 30
Balance, shares at Jun. 30, 2015   144.0          
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 320     298     22
Net income 324            
Other comprehensive income (loss), net of taxes (18)       (18)    
Dividends declared (113)     (113)      
Distributions to noncontrolling interests (19)           (19)
Issuance of common stock under benefit plans, value 11   3     8  
Stock-based compensation expense 36   34     2  
Exercise of stock options, value 38   1     37  
Exercise of stock options, shares   1.0          
Shares to cover employee payroll tax withholdings on stock issued under stock-based compensation plans (9)   (9)        
Purchases of treasury stock, value (390)   (38)     $ (352)  
Purchases of treasury stock, shares   (5.0)       (4.8)  
Balance, value at Jun. 30, 2016 4,569 $ 2 $ 2,472 $ 6,384 $ (56) $ (4,265) $ 32
Balance, shares at Jun. 30, 2016   139.0          
Balance, Value at Dec. 31, 2015 70            
Redeemable Non-controlling Interest [Abstract]              
Net income 4            
Balance, Value at Jun. 30, 2016 $ 74