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Consolidated Statements of Changes in Equity - USD ($)
$ in Millions
Total
Common stock
Additional Paid-in Capital
Common Stock In Treasury, at Cost
Accumulated Other Comprehensive Loss
Retained Earnings
Common stock, shares outstanding (in shares) at Dec. 31, 2015   164,324,270        
Balance at Dec. 31, 2015 $ 5,609 $ 2 $ 3,011 $ (111) $ (864) $ 3,571
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 106         106
Other comprehensive (loss) income (115)       (115)  
Cash dividends declared per common share (200)         (200)
Share repurchase program (in shares)   (1,547,778)        
Share repurchase program (100)   (100)      
Share-based compensation (in shares)   2,361,699        
Share-based compensation $ 86   86      
Stock option exercises, net (in shares) 1,219,820 1,219,820        
Stock option exercises, net $ 41   41      
Other issuances of common stock, net (in shares)   (770,790)        
Other issuances of common stock, net 1   66 (65)    
Issuance of Nasdaq common stock related to a prior acquisition (in shares)   992,247        
Common stock, shares outstanding (in shares) at Dec. 31, 2016   166,579,468        
Balance at Dec. 31, 2016 5,428 $ 2 3,104 (176) (979) 3,477
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 729         729
Other comprehensive (loss) income 117       117  
Cash dividends declared per common share $ (243)         (243)
Share repurchase program (in shares) (2,843,519) (2,843,519)        
Share repurchase program $ (203)   (203)      
Share-based compensation (in shares)   2,384,821        
Share-based compensation $ 70   70      
Stock option exercises, net (in shares) 1,102,830 1,102,830        
Stock option exercises, net $ 24   24      
Other issuances of common stock, net (in shares)   (774,817)        
Other issuances of common stock, net (42)   29 (71)    
Issuance of Nasdaq common stock related to a prior acquisition (in shares)   992,247        
Common stock, shares outstanding (in shares) at Dec. 31, 2017   167,441,030        
Balance at Dec. 31, 2017 5,880 $ 2 3,024 (247) (862) 3,963
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 458         458
Other comprehensive (loss) income (251)       (251)  
Reclassification impact of Tax Reform 0       (417) 417
Cash dividends declared per common share $ (280)         (280)
Share repurchase program (in shares) (4,508,426) (4,508,426)        
Share repurchase program $ (394)   (394)      
Share-based compensation (in shares)   1,528,293        
Share-based compensation $ 69   69      
Stock option exercises, net (in shares) 118,094 118,094        
Stock option exercises, net $ 3   3      
Other issuances of common stock, net (in shares)   (406,134)        
Other issuances of common stock, net (36)   14 (50)    
Issuance of Nasdaq common stock related to a prior acquisition (in shares)   992,247        
Common stock, shares outstanding (in shares) at Dec. 31, 2018   165,165,104        
Balance at Dec. 31, 2018 $ 5,449 $ 2 $ 2,716 $ (297) $ (1,530) $ 4,558