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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, 2017 $ 4,955 $ 2 $ 2,612 $ 7,138 $ (48) $ (4,783) $ 34
Balance, shares at Dec. 31, 2017   135.0          
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          
Balance, value at Dec. 31, 2017 80            
Increase (Decrease) in Temporary Equity [Roll Forward]              
Net income 7            
Distributions to noncontrolling interest partners (10)            
Balance, value at Dec. 31, 2018 77            
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 900     858     42
Other comprehensive income (loss), net of tax 20       20    
Dividends declared (286)     (286)      
Distributions to noncontrolling interest partners (47)           (47)
Issuance of common stock under benefit plans 24   9     15  
Stock-based compensation expense 56   55     1  
Exercise of stock options, value 119   7     112  
Exercise of stock options, shares   2.0          
Shares to cover employee payroll tax withholdings on stock issued under stock-based compensation plans (16)   (16)        
Purchases of treasury stock, value (350)         $ (350)  
Purchases of treasury stock, shares   (4.0)       (3.5)  
Balance, value at Dec. 31, 2019 5,687 $ 2 2,722 8,174 (39) $ (5,218) 46
Balance, shares at Dec. 31, 2019   133.0          
Increase (Decrease) in Temporary Equity [Roll Forward]              
Net income 6            
Distributions to noncontrolling interest partners (7)            
Balance, value at Dec. 31, 2019 76            
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 1,484     1,431     53
Other comprehensive income (loss), net of tax 18       18    
Dividends declared (302)     (302)      
Distributions to noncontrolling interest partners (49)           (49)
Issuance of common stock under benefit plans 25   11     14  
Issuance of common stock under benefit plans, sharers   1.0          
Stock-based compensation expense 97   97        
Exercise of stock options, value 189   26     163  
Exercise of stock options, shares   2.0          
Shares to cover employee payroll tax withholdings on stock issued under stock-based compensation plans (15)   (15)        
Purchases of treasury stock, value (325)         $ (325)  
Purchases of treasury stock, shares   (3.0)       (2.7)  
Balance, value at Dec. 31, 2020 6,809 $ 2 $ 2,841 $ 9,303 $ (21) $ (5,366) $ 50
Balance, shares at Dec. 31, 2020   133.0          
Increase (Decrease) in Temporary Equity [Roll Forward]              
Net income 15            
Distributions to noncontrolling interest partners (9)            
Balance, value at Dec. 31, 2020 $ 82