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Equity - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Oct. 29, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Oct. 25, 2018
Equity [Abstract]          
Common stock, shares authorized   6,500,000,000 6,500,000,000    
Preferred stock, shares authorized   20,000,000      
Accelerated Share Repurchases [Line Items]          
Treasury stock acquired   $ 9,091 $ 4,014 $ 3,434  
Accelerated Share Repurchase Agreement, October 29, 2018          
Accelerated Share Repurchases [Line Items]          
Purchases of treasury stock (in shares) 56,700,000        
Accelerated Share Repurchase Agreement          
Accelerated Share Repurchases [Line Items]          
Shares authorized to be repurchased (in shares)         $ 5,000
Payment under ASR agreement $ 5,000        
Treasury stock acquired 4,000        
Decrease in other-paid-in capital $ 1,000