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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 412           22
Other comprehensive income (loss), net of taxes 1       1    
Dividends declared (143)     (143)      
Distributions to noncontrolling interest partners (23)           (23)
Issuance of common stock under benefit plans 13   4     9  
Stock-based compensation expense 32   31     1  
Exercise of stock options, shares   1.0          
Exercise of stock options, value 66         $ 66  
Shares to cover employee payroll tax withholdings on stock issued under stock-based compensation plans (16)   (16)        
Purchases of treasury stock, shares   (1.0)       (1.1)  
Purchases of treasury stock, value (100)         $ (100)  
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
Balance, Value at Dec. 31, 2018 77            
Redeemable Non-controlling Interest [Abstract]              
Net income 3            
Distributions to noncontrolling interest partners (4)            
Balance, Value at Jun. 30, 2019 76            
Balance, shares at Mar. 31, 2019   134.0          
Balance, value at Mar. 31, 2019 5,341 $ 2 2,671 7,694 (55) (5,022) 51
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 238           12
Other comprehensive income (loss), net of taxes (3)       (3)    
Dividends declared (71)     (71)      
Distributions to noncontrolling interest partners (13)           (13)
Issuance of common stock under benefit plans 7   2     5  
Stock-based compensation expense 15   15      
Exercise of stock options, shares   1.0          
Exercise of stock options, value 46   (1)     47  
Shares to cover employee payroll tax withholdings on stock issued under stock-based compensation plans (1)   (1)        
Purchases of treasury stock, value (50)         (50)  
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
Balance, Value at Mar. 31, 2019 77            
Redeemable Non-controlling Interest [Abstract]              
Net income 1            
Distributions to noncontrolling interest partners (2)            
Balance, Value at Jun. 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 297           13
Other comprehensive income (loss), net of taxes (16)       (16)    
Dividends declared (151)     (151)      
Distributions to noncontrolling interest partners (9)           (9)
Issuance of common stock under benefit plans 13   6     7  
Stock-based compensation expense 31   31        
Exercise of stock options, shares   2.0          
Exercise of stock options, value 117   18     $ 99  
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 Jun. 30, 2020   134.0          
Balance, value at Jun. 30, 2020 5,881 $ 2 2,764 8,307 (55) (5,187) 50
Balance, Value at Dec. 31, 2019 76            
Redeemable Non-controlling Interest [Abstract]              
Net income 2            
Distributions to noncontrolling interest partners (1)            
Balance, Value at Jun. 30, 2020 77            
Balance, shares at Mar. 31, 2020   134.0          
Balance, value at Mar. 31, 2020 5,703 $ 2 2,738 8,197 (58) (5,222) 46
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 192           7
Other comprehensive income (loss), net of taxes 3       3    
Dividends declared (75)     (75)      
Distributions to noncontrolling interest partners (3)           (3)
Issuance of common stock under benefit plans 7   3     4  
Stock-based compensation expense 17   17        
Exercise of stock options, value 37   6     31  
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
Balance, Value at Mar. 31, 2020 76            
Redeemable Non-controlling Interest [Abstract]              
Net income 1            
Balance, Value at Jun. 30, 2020 $ 77