Segment Information (Details) $ in Millions	3 Months Ended
	Mar. 31, 2024 USD ($) segment	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment	2
Number of operating segments | segment	2
Segment Reporting Information [Line Items]
Revenues from contracts with customers	$ 1,538	$ 1,567
Net (loss) gain on commodity derivatives	(24)	15
Income from equity method investments	39	80
Net gain on disposal of assets	0	5
Other income (expense)	(2)	13
Less costs and expenses:
Production	221	201
Shipping, handling and other operating, including related party	169	162
Exploration	7	15
Depreciation, depletion and amortization	524	520
Taxes other than income	96	95
General and administrative	86	82
Net interest and other	69	82
Other net periodic benefit costs	(3)	(3)
Income tax provision (benefit)	85	109
Net income	297	417
Total assets	19,668	20,012	$ 19,575
Capital expenditures	603	601
Permian Basin
Less costs and expenses:
Dry well cost		10
U.S.
Segment Reporting Information [Line Items]
Revenues from contracts with customers	1,422	1,503
Operating Segments | U.S.
Segment Reporting Information [Line Items]
Revenues from contracts with customers	1,422	1,503
Net (loss) gain on commodity derivatives	0	13
Income from equity method investments	0	0
Net gain on disposal of assets		0
Other income (expense)	(4)	11
Less costs and expenses:
Production	201	178
Shipping, handling and other operating, including related party	149	159
Exploration	7	5
Depreciation, depletion and amortization	500	505
Taxes other than income	96	97
General and administrative	38	35
Net interest and other	0	0
Other net periodic benefit costs	0	0
Income tax provision (benefit)	93	123
Net income	334	425
Total assets	18,629	18,696
Capital expenditures	598	597
Operating Segments | Int’l
Segment Reporting Information [Line Items]
Revenues from contracts with customers	116	64
Net (loss) gain on commodity derivatives	0	0
Income from equity method investments	39	80
Net gain on disposal of assets		0
Other income (expense)	1	1
Less costs and expenses:
Production	20	23
Shipping, handling and other operating, including related party	17	3
Exploration	0	0
Depreciation, depletion and amortization	10	12
Taxes other than income	0	0
General and administrative	3	3
Net interest and other	0	0
Other net periodic benefit costs	0	0
Income tax provision (benefit)	24	15
Net income	82	89
Total assets	918	1,148
Capital expenditures	1	2
Not Allocated to Segments
Segment Reporting Information [Line Items]
Revenues from contracts with customers	0	0
Net (loss) gain on commodity derivatives	(24)	2
Income from equity method investments	0	0
Net gain on disposal of assets		5
Other income (expense)	1	1
Less costs and expenses:
Production	0	0
Shipping, handling and other operating, including related party	3	0
Exploration	0	10
Depreciation, depletion and amortization	14	3
Taxes other than income	0	(2)
General and administrative	45	44
Net interest and other	69	82
Other net periodic benefit costs	(3)	(3)
Income tax provision (benefit)	(32)	(29)
Net income	(119)	(97)
Total assets	121	168
Capital expenditures	$ 4	$ 2