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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Accounts receivable, allowances $ 279 $ 261
Common stock, par value (in dollars per share) $ 0.000001 $ 0.000001
Common stock, shares authorized 2,400,000,000 2,400,000,000
Common stock, shares issued 1,186,181,666 1,174,163,069
Treasury stock, shares 428,676,471 428,676,471