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Consolidated Statement of Equity - Shares - shares
shares in Millions
Total
Common Stock
Treasury Stock
Number of common shares issued (beginning balance) at Dec. 31, 2016   731  
Number of common shares issued - stock compensation   1  
Number of common shares issued (ending balance) at Jun. 30, 2017   732  
Number of shares held in treasury (beginning balance) at Dec. 31, 2016     (203)
Number of shares repurchased (23)   (23)
Number of shares returned - stock compensation     0
Number of shares held in treasury (ending balance) at Jun. 30, 2017     (226)
Number of common shares issued (beginning balance) at Dec. 31, 2017 734 734  
Number of common shares issued - stock compensation   1  
Number of common shares issued (ending balance) at Jun. 30, 2018 735 735  
Number of shares held in treasury (beginning balance) at Dec. 31, 2017 (248)   (248)
Number of shares repurchased (31)   (31)
Number of shares returned - stock compensation     0
Number of shares held in treasury (ending balance) at Jun. 30, 2018 (279)   (279)