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Consolidated Balance Sheet (Parenthetical) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Consolidated Balance Sheet [Abstract]    
Allowance for accounts and notes receivable $ 11,000,000 $ 4,000,000
Accumulated depreciation, depletion and amortization $ 66,664,000,000 $ 64,748,000,000
Common stock, shares authorized 2,500,000,000 2,500,000,000
Common stock, par value $ 0.01 $ 0.01
Common stock, shares issued 1,790,924,215 1,785,419,175
Treasury stock, shares 639,682,327 608,312,034