Property, Plant and Equipment - Components of Property, Plant and Equipment (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Total — at cost	$ 31,178	$ 30,519
Less: Reserves for depreciation, depletion, amortization and lease impairment	16,996	16,404
Property, Plant and Equipment— Net	14,182	14,115
Exploration and Production
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment— Net	6,596	7,273
Midstream
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment— Net	3,125	3,111
Operating Segments | Exploration and Production
Property, Plant and Equipment [Line Items]
Unproved properties	184	164
Proved properties	2,877	2,930
Wells, equipment and related facilities	23,745	23,224
Total — at cost	26,806	26,318
Operating Segments | Midstream
Property, Plant and Equipment [Line Items]
Total — at cost	4,342	4,163
Corporate, Interest and Other
Property, Plant and Equipment [Line Items]
Total — at cost	30	38
Property, Plant and Equipment— Net	$ 10	$ 11