Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Consolidated Balance Sheet [Abstract]
Allowance for accounts and notes receivable	$ 2	$ 4
Accumulated depreciation, depletion and amortization	$ 64,735	$ 62,213
Common stock, shares authorized	2,500,000,000	2,500,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares issued	2,091,562,747	1,798,844,267
Treasury stock, shares	789,319,875	730,802,089