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Stockholders' Equity - Summary of Changes in Stockholders' Equity (Details) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Jan. 01, 2018
Dec. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance (in shares) 1,308      
Beginning Balance $ 20,501      
Net income (loss) 1,539 $ 2,699    
Other comprehensive loss, net of tax (42) $ (18)    
Issuances under employee stock purchase plan 48      
Issuances under equity incentive plans 64      
Stock-based compensation 224      
Repurchases of common stock (1,121)      
Dividends declared $ (752)      
Cumulative effect from the adoption of new accounting standards     $ 190  
Ending Balance (in shares) 1,300      
Ending Balance $ 20,651      
Common Stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance (in shares) 1,308      
Beginning Balance $ 1      
Issuances under employee stock purchase plan (in shares) 1      
Issuances under equity incentive plans (in shares) 5      
Repurchases of common stock (in shares) (14)      
Ending Balance (in shares) 1,300      
Ending Balance $ 1      
Additional Paid-In Capital        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 1,264      
Issuances under employee stock purchase plan 48      
Issuances under equity incentive plans 64      
Stock-based compensation 224      
Repurchases of common stock (36)      
Ending Balance 1,564      
Accumulated Other Comprehensive Income (Loss)        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 165      
Other comprehensive loss, net of tax (42)      
Cumulative effect from the adoption of new accounting standards     (293) $ (293)
Ending Balance (170)      
Retained Earnings        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 19,012      
Net income (loss) 1,538      
Repurchases of common stock (1,085)      
Dividends declared (752)      
Cumulative effect from the adoption of new accounting standards     $ 483  
Ending Balance 19,196      
Noncontrolling Interest        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Beginning Balance 59      
Net income (loss) 1      
Ending Balance $ 60