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Capital Stock Capital Stock - Additional Information (Details) - USD ($)
12 Months Ended 60 Months Ended
Jan. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Class of Stock [Line Items]          
Common stock, shares authorized (in shares)   5,000,000,000 5,000,000,000   5,000,000,000
Preferred stock, shares issued (in shares)   0 0 0 0
Preferred stock, shares outstanding (in shares)   0 0 0 0
Cost of shares repurchased   $ 1,994,000,000 $ 2,202,000,000 $ 2,601,000,000  
Common Class A          
Class of Stock [Line Items]          
Common stock, shares authorized (in shares)   5,000,000,000.0      
Preferred stock, shares authorized (in shares)   500,000,000      
Common stock reserved for stock option and other stock awards (in shares)   111,000,000      
Stock repurchase value   $ 13,700,000,000      
Cost of shares repurchased   $ 2,000,000,000.0      
Number of shares repurchased (in shares)   47,258,884 50,598,902 61,972,713  
Average cost of shares repurchased   $ 42.18      
Stock repurchase remaining amount   $ 4,700,000,000      
Common Class A | Share Repurchase Program amended January 1, 2018          
Class of Stock [Line Items]          
Stock repurchase value $ 19,700,000,000        
Increase in share repurchase value $ 6,000,000,000.0        
Stock repurchase expiration date Dec. 31, 2020        
Common Stock | Prior to January 1, 2018          
Class of Stock [Line Items]          
Cost of shares repurchased         $ 13,000,000,000.0