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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 689     645     44
Other comprehensive income (loss), net of tax (34)       (34)    
Dividends declared (231)     (231)      
Distributions to noncontrolling interest partners (41)           (41)
Issuance of common stock under benefit plans 22   7     15  
Stock-based compensation expense 69   65     4  
Exercise of stock options, value 73   2     71  
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 (590)         $ (590)  
Purchases of treasury stock, shares   (7.0)       (7.4)  
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          
Balance, value at Dec. 31, 2015 70            
Increase (Decrease) in Temporary Equity [Roll Forward]              
Net income 7            
Balance, value at Dec. 31, 2016 77            
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 817     772     45
Other comprehensive income (loss), net of tax 24       24    
Dividends declared (247)     (247)      
Distributions to noncontrolling interest partners (47)           (47)
Issuance of common stock under benefit plans 23   11     12  
Stock-based compensation expense 79   75     4  
Exercise of stock options, value 130   4     126  
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 (465)         $ (465)  
Purchases of treasury stock, shares   (5.0)       (4.6)  
Contributions from noncontrolling interest partners 4           4
Balance, value at Dec. 31, 2017 4,955 $ 2 2,612 7,138 (48) $ (4,783) 34
Balance, shares at Dec. 31, 2017   135.0          
Increase (Decrease) in Temporary Equity [Roll Forward]              
Net income 7            
Distributions to noncontrolling interest partners (4)            
Balance, value at Dec. 31, 2017 80            
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 781     736     45
Other comprehensive income (loss), net of tax (9)       (9)    
Dividends declared (274)     (274)      
Distributions to noncontrolling interest partners (44)           (44)
Issuance of common stock under benefit plans 28   14     14  
Stock-based compensation expense 61   56     5  
Exercise of stock options, value 99   6     93  
Exercise of stock options, shares   3.0          
Shares to cover employee payroll tax withholdings on stock issued under stock-based compensation plans (21)   (21)        
Purchases of treasury stock, value (325)         $ (325)  
Purchases of treasury stock, shares   (3.0)       (3.4)  
Contributions from noncontrolling interest partners 16           16
Reclassification of stranded tax effects resulting from enactment of the Tax Cuts and Jobs Act 0     2 (2)    
Balance, value at Dec. 31, 2018 5,267 $ 2 $ 2,667 $ 7,602 $ (59) $ (4,996) $ 51
Balance, shares at Dec. 31, 2018   135.0          
Increase (Decrease) in Temporary Equity [Roll Forward]              
Net income 7            
Distributions to noncontrolling interest partners (10)            
Balance, value at Dec. 31, 2018 $ 77