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Consolidated Balance Sheet (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]    
Accounts and notes receivable - allowance $ 41 $ 55
Common stock authorized, shares 2,500,000,000 2,500,000,000
Common stock, par value (in usd per share) $ 0.01 $ 0.01
Common stock issued, shares 640,607,106 639,336,287
Treasury stock, shares 117,757,779 109,925,907