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Consolidated Statements of Equity - Shares of Treasury Stock - shares
shares in Millions
Total
Treasury Stock
Beginning balance at Dec. 31, 2017   (248)
Number of shares repurchased   (19)
Number of shares returned - stock compensation   0
Ending balance at Mar. 31, 2018   (267)
Beginning balance at Dec. 31, 2017   (248)
Number of shares repurchased (36)  
Ending balance at Sep. 30, 2018   (284)
Beginning balance at Mar. 31, 2018   (267)
Number of shares repurchased   (12)
Number of shares returned - stock compensation   0
Ending balance at Jun. 30, 2018   (279)
Number of shares repurchased (5) (5)
Number of shares returned - stock compensation   0
Ending balance at Sep. 30, 2018   (284)
Beginning balance at Dec. 31, 2018 (295) (295)
Number of shares repurchased   (14)
Number of shares returned - stock compensation   0
Ending balance at Mar. 31, 2019   (309)
Beginning balance at Dec. 31, 2018 (295) (295)
Number of shares repurchased (33)  
Ending balance at Sep. 30, 2019 (328) (328)
Beginning balance at Mar. 31, 2019   (309)
Number of shares repurchased   (9)
Number of shares returned - stock compensation   0
Ending balance at Jun. 30, 2019   (318)
Number of shares repurchased (10) (10)
Number of shares returned - stock compensation   0
Ending balance at Sep. 30, 2019 (328) (328)