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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, shares at Dec. 31, 2018   135.0          
Balance, value at Dec. 31, 2018 $ 5,267 $ 2 $ 2,667 $ 7,602 $ (59) $ (4,996) $ 51
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 637     605     32
Other comprehensive income (loss), net of taxes 4       4    
Dividends declared (215)     (215)      
Distributions to noncontrolling interest partners (34)           (34)
Issuance of common stock under benefit plans 19   7     12  
Stock-based compensation expense 44   43     1  
Exercise of stock options, shares   2.0          
Exercise of stock options, value 98   4     $ 94  
Shares to cover employee payroll tax withholdings on stock issued under stock-based compensation plans (16)   (16)        
Purchases of treasury stock, shares   (2.0)       (1.6)  
Purchases of treasury stock, value (150)         $ (150)  
Balance, shares at Sep. 30, 2019   135.0          
Balance, value at Sep. 30, 2019 5,654 $ 2 2,705 7,992 (55) (5,039) 49
Balance, Value at Dec. 31, 2018 77            
Redeemable Non-controlling Interest [Abstract]              
Net income 4            
Distributions to noncontrolling interest partners (5)            
Balance, Value at Sep. 30, 2019 76            
Balance, shares at Jun. 30, 2019   135.0          
Balance, value at Jun. 30, 2019 5,509 $ 2 2,686 7,849 (58) (5,020) 50
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 225     215     10
Other comprehensive income (loss), net of taxes 3       3    
Dividends declared (72)     (72)      
Distributions to noncontrolling interest partners (11)           (11)
Issuance of common stock under benefit plans 6   3     3  
Stock-based compensation expense 12   12        
Exercise of stock options, shares   1.0          
Exercise of stock options, value 32   4     28  
Purchases of treasury stock, shares   (1.0)          
Purchases of treasury stock, value (50)         (50)  
Balance, shares at Sep. 30, 2019   135.0          
Balance, value at Sep. 30, 2019 5,654 $ 2 2,705 7,992 (55) (5,039) 49
Balance, Value at Jun. 30, 2019 76            
Redeemable Non-controlling Interest [Abstract]              
Net income 1            
Distributions to noncontrolling interest partners (1)            
Balance, Value at Sep. 30, 2019 76            
Balance, shares at Dec. 31, 2019   133.0          
Balance, value at Dec. 31, 2019 5,687 $ 2 2,722 8,174 (39) (5,218) 46
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 883     852     31
Other comprehensive income (loss), net of taxes (3)       (3)    
Dividends declared (226)     (226)      
Distributions to noncontrolling interest partners (31)           (31)
Issuance of common stock under benefit plans, shares   1.0          
Issuance of common stock under benefit plans 17   7     10  
Stock-based compensation expense 63   63        
Exercise of stock options, shares   2.0          
Exercise of stock options, value 144   22     $ 122  
Shares to cover employee payroll tax withholdings on stock issued under stock-based compensation plans (13)   (13)        
Purchases of treasury stock, shares   (1.0)       (0.7)  
Purchases of treasury stock, value (75)         $ (75)  
Balance, shares at Sep. 30, 2020   135.0          
Balance, value at Sep. 30, 2020 6,446 $ 2 2,801 8,800 (42) (5,161) 46
Balance, Value at Dec. 31, 2019 76            
Redeemable Non-controlling Interest [Abstract]              
Net income 7            
Distributions to noncontrolling interest partners (3)            
Balance, Value at Sep. 30, 2020 80            
Balance, shares at Jun. 30, 2020   134.0          
Balance, value at Jun. 30, 2020 5,881 $ 2 2,764 8,307 (55) (5,187) 50
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 586     568     18
Other comprehensive income (loss), net of taxes 13       13    
Dividends declared (75)     (75)      
Distributions to noncontrolling interest partners (22)           (22)
Issuance of common stock under benefit plans, shares   1.0          
Issuance of common stock under benefit plans 4   1     3  
Stock-based compensation expense 32   32        
Exercise of stock options, value 27   4     23  
Balance, shares at Sep. 30, 2020   135.0          
Balance, value at Sep. 30, 2020 6,446 $ 2 $ 2,801 $ 8,800 $ (42) $ (5,161) $ 46
Balance, Value at Jun. 30, 2020 77            
Redeemable Non-controlling Interest [Abstract]              
Net income 5            
Distributions to noncontrolling interest partners (2)            
Balance, Value at Sep. 30, 2020 $ 80