Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Allowance for accounts and notes receivable	$ 2	$ 2
Accumulated depreciation, depletion and amortization	$ 64,711	$ 64,735
Common stock, shares authorized (in shares)	2,500,000,000	2,500,000,000
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares issued (in shares)	2,098,495,534	2,091,562,747
Treasury stock, shares (in shares)	805,045,987	789,319,875