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Consolidated Balance Sheet (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Consolidated Balance Sheet [Abstract]    
Allowance for accounts and notes receivable $ 11 $ 25
Accumulated depreciation, depletion and amortization $ 60,043 $ 64,899
Common stock, shares authorized 2,500,000,000 2,500,000,000
Common stock, par value $ 0.010 $ 0.01
Common stock, shares issued 1,794,922,850 1,791,637,434
Treasury stock, shares 684,781,255 653,288,213