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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Unaudited) - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Treasury Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2017 $ 9,462 $ 0 $ (5,563) $ 10,747 $ 4,916 $ (638)
Balance (in shares) at Dec. 31, 2017   1,186 429      
Components of comprehensive income:            
Net income 500       500  
Other comprehensive loss (14)         (14)
Issuance of common stock pursuant to employee stock options 47     47    
Issuance of common stock pursuant to employee stock options (in shares)   3        
Issuance of common stock pursuant to restricted stock units 0     0    
Issuance of common stock pursuant to restricted stock units (in shares)   2        
Restricted stock surrendered for employees’ tax liability (64)     (64)    
Restricted stock surrendered for employees' tax liability (in shares)   (1)        
Share-based compensation expense related to employee stock options and restricted stock units 56     56    
Dividends ($0.37 and $0.34 per common share) (259)       (259)  
Ending balance at Mar. 31, 2018 9,819 $ 0 $ (5,563) 10,786 5,245 (649)
Balance (in shares) at Mar. 31, 2018   1,190 429      
Beginning balance at Dec. 31, 2017 9,462 $ 0 $ (5,563) 10,747 4,916 (638)
Balance (in shares) at Dec. 31, 2017   1,186 429      
Components of comprehensive income:            
Net income 902          
Other comprehensive loss 30          
Ending balance at Jun. 30, 2018 10,346 $ 0 $ (5,563) 10,867 5,647 (605)
Balance (in shares) at Jun. 30, 2018   1,191 429      
Beginning balance at Mar. 31, 2018 9,819 $ 0 $ (5,563) 10,786 5,245 (649)
Balance (in shares) at Mar. 31, 2018   1,190 429      
Components of comprehensive income:            
Net income 402       402  
Other comprehensive loss 44         44
Issuance of common stock pursuant to employee stock options 30     30    
Issuance of common stock pursuant to employee stock options (in shares)   1        
Restricted stock surrendered for employees’ tax liability (10)     (10)    
Restricted stock surrendered for employees' tax liability (in shares)   0        
Share-based compensation expense related to employee stock options and restricted stock units 61     61    
Ending balance at Jun. 30, 2018 10,346 $ 0 $ (5,563) 10,867 5,647 (605)
Balance (in shares) at Jun. 30, 2018   1,191 429      
Beginning balance at Dec. 31, 2018 11,392 $ 0 $ (5,563) 10,963 6,593 (601)
Balance (in shares) at Dec. 31, 2018   1,192 429      
Components of comprehensive income:            
Net income 447       447  
Other comprehensive loss (1)         (1)
Issuance of common stock pursuant to employee stock options 30     30    
Issuance of common stock pursuant to employee stock options (in shares)   2        
Issuance of common stock pursuant to restricted stock units 0     0    
Issuance of common stock pursuant to restricted stock units (in shares)   2        
Restricted stock surrendered for employees’ tax liability (45)     (45)    
Restricted stock surrendered for employees' tax liability (in shares)   (1)        
Share-based compensation expense related to employee stock options and restricted stock units 56     56    
Dividends ($0.37 and $0.34 per common share) (283)       (283)  
Ending balance at Mar. 31, 2019 11,596 $ 0 $ (5,563) 11,004 6,757 (602)
Balance (in shares) at Mar. 31, 2019   1,195 429      
Beginning balance at Dec. 31, 2018 11,392 $ 0 $ (5,563) 10,963 6,593 (601)
Balance (in shares) at Dec. 31, 2018   1,192 429      
Components of comprehensive income:            
Net income 774          
Other comprehensive loss (7)          
Ending balance at Jun. 30, 2019 11,977 $ 0 $ (5,563) 11,063 7,085 (608)
Balance (in shares) at Jun. 30, 2019   1,196 429      
Beginning balance at Mar. 31, 2019 11,596 $ 0 $ (5,563) 11,004 6,757 (602)
Balance (in shares) at Mar. 31, 2019   1,195 429      
Components of comprehensive income:            
Net income 328       328  
Other comprehensive loss (6)         (6)
Issuance of common stock pursuant to employee stock options 28     28    
Issuance of common stock pursuant to employee stock options (in shares)   1        
Restricted stock surrendered for employees’ tax liability (4)     (4)    
Restricted stock surrendered for employees' tax liability (in shares)   0        
Share-based compensation expense related to employee stock options and restricted stock units 35     35    
Ending balance at Jun. 30, 2019 $ 11,977 $ 0 $ (5,563) $ 11,063 $ 7,085 $ (608)
Balance (in shares) at Jun. 30, 2019   1,196 429