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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Number of shares of common stock [Member]
Common stock and additional paid-in capital [Member]
Accumulated deficit [Member]
Accumulated other comprehensive loss [Member]
Beginning Balance, Shares at Dec. 31, 2015   754.0      
Beginning Balance at Dec. 31, 2015 $ 28,083   $ 30,649 $ (2,086) $ (480)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 7,722     7,722  
Other comprehensive income (loss), net of tax 9       9
Dividends declared on common stock (3,120)     (3,120)  
Issuance of common stock in connection with the Company’s equity award programs, Shares   3.9      
Issuance of common stock in connection with the Company’s equity award programs 55   55    
Stock-based compensation expense 342   342    
Tax impact related to employee stock-based compensation expense (189)   (262) 73  
Repurchases of common stock, Shares   (19.7)      
Repurchases of common stock (3,027)     (3,027)  
Ending Balance, Shares at Dec. 31, 2016   738.2      
Ending Balance at Dec. 31, 2016 29,875   30,784 (438) (471)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 1,979     1,979  
Other comprehensive income (loss), net of tax (208)       (208)
Dividends declared on common stock (3,487)     (3,487)  
Issuance of common stock in connection with the Company’s equity award programs, Shares   2.5      
Issuance of common stock in connection with the Company’s equity award programs 52   52    
Stock-based compensation expense 347   347    
Tax impact related to employee stock-based compensation expense (191)   (191)    
Repurchases of common stock, Shares   (18.5)      
Repurchases of common stock $ (3,126)     (3,126)  
Ending Balance, Shares at Dec. 31, 2017 722.2 722.2      
Ending Balance at Dec. 31, 2017 $ 25,241   30,992 (5,072) (679)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 8,394     8,394  
Other comprehensive income (loss), net of tax (81)       (81)
Dividends declared on common stock (3,482)     (3,482)  
Issuance of common stock in connection with the Company’s equity award programs, Shares   1.9      
Issuance of common stock in connection with the Company’s equity award programs 56   56    
Stock-based compensation expense 327   327    
Tax impact related to employee stock-based compensation expense (129)   (129)    
Repurchases of common stock, Shares   (94.5)      
Repurchases of common stock $ (17,855)     (17,855)  
Ending Balance, Shares at Dec. 31, 2018 629.6 629.6      
Ending Balance at Dec. 31, 2018 $ 12,500   $ 31,246 $ (17,977) $ (769)