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Consolidated Statements of Shareholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Additional Paid-In Capital
Accumulated Other Comprehensive Loss
Retained Earnings
Treasury Shares
New Accounting Pronouncement, Early Adoption, Effect
Accumulated Other Comprehensive Loss
New Accounting Pronouncement, Early Adoption, Effect
Retained Earnings
Balance at beginning of period (in shares) at Dec. 31, 2015   791       340    
Balance at beginning of period at Dec. 31, 2015 $ 2,660 $ 8 $ 948 $ (74) $ 8,064 $ (6,286)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 930       930      
Other comprehensive income (loss) (2)     (2)        
Share-based compensation 68   68          
Shares issued under stock plans including income tax benefits (in shares)           (4)    
Shares issued under stock plans including income tax benefits 83   0     $ 83    
Purchases of treasury stock (in shares)           24    
Purchases of treasury stock (1,198)         $ (1,198)    
Balance at end of period (in shares) at Dec. 31, 2016   791       360    
Balance at end of period at Dec. 31, 2016 2,541 $ 8 1,016 (76) 8,994 $ (7,401)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 1,246       1,246      
Other comprehensive income (loss) 22     22        
Share-based compensation 63   63          
Shares issued under stock plans including income tax benefits (in shares)           (4)    
Shares issued under stock plans including income tax benefits 30   (48)     $ 78    
Purchases of treasury stock (in shares)           20    
Purchases of treasury stock (1,171)         $ (1,171)    
Balance at end of period (in shares) at Dec. 31, 2017   791       376    
Balance at end of period at Dec. 31, 2017 2,731 $ 8 1,031 (54) 10,240 $ (8,494)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Cumulative effect of new accounting principle | Accounting Standards Update 2014-09 208       208      
Cumulative effect of new accounting principle | Accounting Standards Update 2017-12             $ 3 $ (3)
Cumulative effect of new accounting principle | Accounting Standards Update 2018-02             $ (3) 3
Net income 1,187       1,187      
Other comprehensive income (loss) (13)     (13)        
Share-based compensation 73   73          
Shares issued under stock plans including income tax benefits (in shares)           (3)    
Shares issued under stock plans including income tax benefits 22   (47)     $ 69    
Purchases of treasury stock (in shares)           26    
Purchases of treasury stock (1,915)         $ (1,915)    
Balance at end of period (in shares) at Dec. 31, 2018   791       399    
Balance at end of period at Dec. 31, 2018 $ 2,293 $ 8 $ 1,057 $ (67) $ 11,635 $ (10,340)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Cumulative effect of new accounting principle | Accounting Standards Update 2017-12               (3)
Cumulative effect of new accounting principle | Accounting Standards Update 2018-02               $ 3