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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, 2017   135.0          
Balance, value at Dec. 31, 2017 $ 4,955 $ 2 $ 2,612 $ 7,138 $ (48) $ (4,783) $ 34
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 419     396     23
Other comprehensive (loss) income, net of taxes (7)       (7)    
Dividends declared (135)     (135)      
Distributions to noncontrolling interest partners (21)           (21)
Issuance of common stock under benefit plans 13   6     7  
Stock-based compensation expense 34   32     2  
Exercise of stock options, shares   1.0          
Exercise of stock options, value 71   3     $ 68  
Shares to cover employee payroll tax withholdings on stock issued under stock-based compensation plans, value (20)   (20)        
Purchases of treasury stock, shares           (0.5)  
Purchases of treasury stock, value (50)         $ (50)  
Contributions from noncontrolling interest partners 4           4
Reclassification of stranded tax effects resulting from enactment of the Tax Cut and Jobs Act 0     2 (2)    
Balance, shares at Jun. 30, 2018   136.0          
Balance, value at Jun. 30, 2018 5,263 $ 2 2,633 7,401 (57) (4,756) 40
Balance, Value at Dec. 31, 2017 80            
Redeemable Non-controlling Interest [Abstract]              
Net income 3            
Distributions to noncontrolling interest partners (7)            
Balance, Value at Jun. 30, 2018 76            
Balance, shares at Mar. 31, 2018   136.0          
Balance, value at Mar. 31, 2018 5,066 $ 2 2,616 7,249 (41) (4,796) 36
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 231     219     12
Other comprehensive (loss) income, net of taxes (14)       (14)    
Dividends declared (69)     (69)      
Distributions to noncontrolling interest partners (10)           (10)
Issuance of common stock under benefit plans 5   2     3  
Stock-based compensation expense 15   14     1  
Exercise of stock options, value 37   1     36  
Contributions from noncontrolling interest partners 2           2
Reclassification of stranded tax effects resulting from enactment of the Tax Cut and Jobs Act 0     2 (2)    
Balance, shares at Jun. 30, 2018   136.0          
Balance, value at Jun. 30, 2018 5,263 $ 2 2,633 7,401 (57) (4,756) 40
Balance, Value at Mar. 31, 2018 77            
Redeemable Non-controlling Interest [Abstract]              
Net income 2            
Distributions to noncontrolling interest partners (3)            
Balance, Value at Jun. 30, 2018 76            
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     390     22
Other comprehensive (loss) income, 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, value (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     226     12
Other comprehensive (loss) income, 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, value (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