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Consolidated Balance Sheet (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Statement of Financial Position [Abstract]    
Allowance for accounts and notes receivable $ 34 $ 55
Common Stock, shares authorized (in shares) 2,500,000,000 2,500,000,000
Common Stock, Par Value (in usd per share) $ 0.01 $ 0.01
Common Stock, shares issued (in shares) 641,593,854 639,336,287
Treasury Stock, shares repurchased (in shares) 122,827,264 109,925,907