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CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (UNAUDITED) (PARENTHETICAL) - shares
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]        
Common stock, shares outstanding 479,026,001 479,562,326 484,724,245  
Treasury stock, shares [1] 22,865,242 22,328,917 17,166,998 15,760,000
[1] Shares may not add due to rounding.