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Consolidated Statements of Equity - Shares - shares
shares in Millions
Total
Common Stock
Treasury Stock
Number of shares issued (beginning balance) at Dec. 31, 2013   724  
Number of shares issued - stock-based compensation   2  
Number of shares issued (ending balance) at Dec. 31, 2014   726  
Number of shares held in treasury (beginning balance) at Dec. 31, 2013     (130)
Number of shares repurchased (49)   (49)
Number of shares held in treasury (ending balance) at Dec. 31, 2014     (179)
Number of shares issued - stock-based compensation   3  
Number of shares issued (ending balance) at Dec. 31, 2015 729 729  
Number of shares repurchased (19)   (19)
Number of shares held in treasury (ending balance) at Dec. 31, 2015 (198)   (198)
Number of shares issued - stock-based compensation   2  
Number of shares issued (ending balance) at Dec. 31, 2016 731 731  
Number of shares repurchased (4)   (4)
Number of shares returned - stock-based compensation     (1)
Number of shares held in treasury (ending balance) at Dec. 31, 2016 (203)   (203)