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Equity (Tables)
12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Summary of Common Stock and Treasury Stock Transactions
A summary of common stock and treasury stock transactions (shares in millions) is as follows:
 
2019
 
2018
 
2017
  
Common
Stock
 
Treasury
Stock
 
Common
Stock
 
Treasury
Stock
 
Common
Stock
 
Treasury
Stock
Balance January 1
3,577

 
985

 
3,577

 
880

 
3,577

 
828

Purchases of treasury stock

 
66

 

 
122

 

 
67

Issuances (1) 

 
(13
)
 

 
(17
)
 

 
(15
)
Balance December 31
3,577

 
1,038

 
3,577

 
985

 
3,577

 
880


(1)  
Issuances primarily reflect activity under share-based compensation plans.