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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, 2015   729  
Number of shares issued - stock-based compensation   1  
Number of common shares issued (ending balance) at Mar. 31, 2016   730  
Number of shares held in treasury (beginning balance) at Dec. 31, 2015     (198)
Number of shares repurchased (2)   (2)
Number of shares held in treasury (ending balance) at Mar. 31, 2016     (200)
Number of common shares issued (beginning balance) at Dec. 31, 2016 731 731  
Number of common shares issued (ending balance) at Mar. 31, 2017 731 731  
Number of shares held in treasury (beginning balance) at Dec. 31, 2016 (203)   (203)
Number of shares repurchased (9)   (9)
Number of shares held in treasury (ending balance) at Mar. 31, 2017 (212)   (212)