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Stockholders' Equity - Summary of Changes in Stockholders' Equity (Details) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jan. 01, 2018
Noncontrolling Interest, Period Increase (Decrease)     $ 82    
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance (in shares)     1,308    
Balance at December 31, 2017     $ 20,501    
Net income (loss) $ 2,099 $ 2,712 5,457 $ 8,480  
Other comprehensive income, net of tax $ 34 $ 129 164 $ (29)  
Issuances under employee stock purchase plan     91    
Issuances under equity incentive plans     167    
Stock-based compensation     667    
Repurchases of common stock     (2,067)    
Dividends declared     $ (2,245)    
Cumulative effect from the adoption of new accounting standards         $ 190
Ending Balance (in shares) 1,294   1,294    
Balance at September 30, 2018 $ 23,007   $ 23,007    
Common Stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning Balance (in shares)     1,308    
Balance at December 31, 2017     $ 1    
Issuances under employee stock purchase plan (in shares)     1    
Issuances under equity incentive plans (in shares)     12    
Repurchases of common stock (in shares)     (27)    
Ending Balance (in shares) 1,294   1,294    
Balance at September 30, 2018 $ 1   $ 1    
Additional Paid-In Capital          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance at December 31, 2017     1,264    
Issuances under employee stock purchase plan     91    
Issuances under equity incentive plans     167    
Stock-based compensation     667    
Repurchases of common stock     (71)    
Balance at September 30, 2018 2,118   2,118    
Accumulated Other Comprehensive Income (Loss)          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance at December 31, 2017     165    
Other comprehensive income, net of tax     164    
Cumulative effect from the adoption of new accounting standards         (293)
Balance at September 30, 2018 36   36    
Retained Earnings          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance at December 31, 2017     19,012    
Net income (loss)     5,452    
Repurchases of common stock     (1,996)    
Dividends declared     (2,245)    
Cumulative effect from the adoption of new accounting standards         $ 483
Balance at September 30, 2018 20,706   20,706    
Noncontrolling Interest          
Noncontrolling Interest, Period Increase (Decrease)     82    
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance at December 31, 2017     59    
Net income (loss)     5    
Balance at September 30, 2018 $ 146   $ 146