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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          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 70     61     9
Other comprehensive loss, net of taxes (3)       (3)    
Dividends declared (55)     (55)      
Distributions to noncontrolling interests (10)           (10)
Issuance of common stock under benefit plans, value 5   1     4  
Issuance of common stock under benefit plans, shares   1          
Stock-based compensation expense 12   11     1  
Exercise of stock options, value 35         35  
Exercise of stock options, shares   1          
Shares to cover employee payroll tax withholdings on stock issued under benefit plans, value (6)   (6)        
Tax benefits associated with stock-based compensation plans 3   3        
Purchases of treasury stock, value (110)         (110)  
Purchases of treasury stock, shares   (2)          
Balance, value at Mar. 31, 2015 4,271 $ 2 2,427 5,729 (30) (3,885) 28
Balance, shares at Mar. 31, 2015   144          
Balance, value at Dec. 31, 2015 4,713 $ 2 2,481 6,199 (38) (3,960) 29
Balance, shares at Dec. 31, 2015   143          
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 112     102     10
Net income 114            
Other comprehensive loss, net of taxes (2)       (2)    
Dividends declared (57)     (57)      
Distributions to noncontrolling interests (9)           (9)
Issuance of common stock under benefit plans, value 5   1     4  
Stock-based compensation expense 18   17     1  
Exercise of stock options, value 7         7  
Shares to cover employee payroll tax withholdings on stock issued under benefit plans, value (8)   (8)        
Tax benefits associated with stock-based compensation plans 2   2        
Purchases of treasury stock, value (115)         (115)  
Purchases of treasury stock, shares   (2)          
Balance, value at Mar. 31, 2016 4,666 $ 2 $ 2,493 $ 6,244 $ (40) $ (4,063) $ 30
Balance, shares at Mar. 31, 2016   141          
Balance, Value at Dec. 31, 2015 70            
Redeemable Non-controlling Interest [Abstract]              
Net income 2            
Balance, Value at Mar. 31, 2016 $ 72