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Consolidated Statements of Equity - USD ($)
$ in Millions
Total
Common Stock [Member]
Capital Surplus [Member]
Treasury Stock [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Noncontrolling Interest [Member]
Beginning Balance at Dec. 31, 2016 $ 4,596 $ 1,157 $ 2,818 $ (242) $ 431 $ 371 $ 61
Repurchase of common stock (297)     (297)      
Issuance of senior unsecured convertible bonds 242   242        
Settlement of senior unsecured convertible bonds (42)   (403) 361      
Stock-based compensation expense 61   61 46 (46)    
Comprehensive income (loss):              
Net income 810       802   8
Other comprehensive income (loss), net of tax 317         317  
Comprehensive income (loss) 1,127            
Dividends to noncontrolling interest (6)           (6)
Dividends (214)       (214)    
Ending Balance at Dec. 31, 2017 5,467 1,157 2,718 (132) 973 688 63
Repurchase of common stock (62)     (62)      
Stock-based compensation expense 125   125 53 (53)    
Comprehensive income (loss):              
Net income 1,293       1,287   6
Other comprehensive income (loss), net of tax (179)         (179)  
Comprehensive income (loss) 1,114            
Dividends to noncontrolling interest (4)           (4)
Dividends (216)       (216)    
Ending Balance at Dec. 31, 2018 6,424 1,157 2,843 (141) 1,991 509 65
Contribution of noncontrolling interest 8           8
Business combination 61           61
Repurchase of noncontrolling interest (61)   4       (65)
Repurchase of common stock (250)     (250)      
Stock-based compensation expense 145   145 63 (63)    
Comprehensive income (loss):              
Net income 1,033       1,032   1
Other comprehensive income (loss), net of tax (34)         (34)  
Comprehensive income (loss) 999            
Dividends to noncontrolling interest (2)           (2)
Dividends (213)       (213)    
Ending Balance at Dec. 31, 2019 $ 7,111 $ 1,157 $ 2,992 $ (328) $ 2,747 $ 475 $ 68