Supplemental Oil and Gas Information (Unaudited) - Summary of Proved Reserves Based on Average Prices (Details) MMcf in Millions, MMBbls in Millions, ft³ in Billions	12 Months Ended
	Dec. 31, 2022 MMBbls ft³	Dec. 31, 2022 ft³ MMBbls	Dec. 31, 2022 ft³ MMBbls MMcf	Dec. 31, 2021 MMBbls ft³ MMcf	Dec. 31, 2020 MMBbls ft³ MMcf	Dec. 31, 2019 MMBbls ft³
Proved developed and undeveloped oil reserves:
Proved developed reserves	436.0	436.0	436.0	419.2	410.8	472.3
Proved undeveloped reserves	279.4	279.4	279.4	297.7	304.1	352.7
Crude Oil
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance	716.9			714.9	825.0
Revisions of previous estimates	(23.6)			(52.9)	(194.7)
Improved recovery	5.3
Extensions and discoveries	80.1			109.4	150.3
Purchases of properties	5.0			7.4
Sales of properties	(4.4)			(0.7)	(1.7)
Production	(63.9)			(61.1)	(63.9)
Proved developed and undeveloped reserves, ending balance	715.4			716.9	714.9
Net crude oil and condensate revenue | Crude Oil
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance	291.5			266.5	423.9
Revisions of previous estimates	23.4			39.3	(137.4)
Improved recovery	4.7
Extensions and discoveries	18.9			14.1	19.6
Purchases of properties	4.2			6.4
Sales of properties	(3.6)				(1.5)
Production	(35.5)			(34.9)	(38.1)
Proved developed and undeveloped reserves, ending balance	303.6			291.5	266.5
Proved developed reserves	209.0	209.0	209.0	191.5	179.8	230.9
Proved undeveloped reserves	94.6	94.6	94.6	99.9	86.7	193.0
Net natural gas liquids revenue
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance	38.4			38.2	56.1
Revisions of previous estimates	4.4			1.4	(16.4)
Improved recovery | MMcf			0.2
Extensions and discoveries	2.5			2.5	2.8
Purchases of properties	0.3			0.1
Sales of properties	(0.2)				(0.1)
Production	(3.9)			(3.8)	(4.2)
Proved developed and undeveloped reserves, ending balance	41.7			38.4	38.2
Proved developed reserves	29.7	29.7	29.7	28.4	28.7	28.1
Proved undeveloped reserves	12.0	12.0	12.0	10.0	9.5	28.0
Net natural gas revenue
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance | ft³		2,322.3		2,461.0	2,069.7
Revisions of previous estimates | ft³		(309.8)		(562.2)	(245.4)
Improved recovery | MMcf			2,600.0
Extensions and discoveries | ft³		352.4		556.7	767.2
Purchases of properties | ft³		2.9		5.4
Sales of properties		(3.6)		(4,400.0)	(0.7)
Production | ft³		(146.9)		(134.2)	(129.8)
Proved developed and undeveloped reserves, ending balance | ft³		2,219.9		2,322.3	2,461.0
Proved developed reserves | ft³	1,183.1	1,183.1	1,183.1	1,196.0	1,213.8	1,279.8
Proved undeveloped reserves | ft³	1,036.8	1,036.8	1,036.8	1,126.4	1,247.2	789.9
MP Gulf of Mexico LLC
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped reserves, ending balance	18.2
Proved developed reserves	15.0	15.0	15.0
Proved undeveloped reserves	3.2	3.2	3.2
MP Gulf of Mexico LLC | Net crude oil and condensate revenue
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped reserves, ending balance	16.5
Proved developed reserves	13.7	13.7	13.7
Proved undeveloped reserves	2.8	2.8	2.8
MP Gulf of Mexico LLC | Net natural gas liquids revenue
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped reserves, ending balance	0.6	0.8
Proved developed reserves	0.5	0.5	0.5
Proved undeveloped reserves	0.1	0.1	0.1
MP Gulf of Mexico LLC | Net natural gas revenue
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped reserves, ending balance | ft³		5.6
Proved developed reserves | ft³	4.2	4.2	4.2
Proved undeveloped reserves | ft³	1.4	1.4	1.4
U.S.
Proved developed and undeveloped oil reserves:
Proved developed reserves	264.2	264.2	264.2	241.9	230.3	273.4
Proved undeveloped reserves	92.8	92.8	92.8	101.6	98.2	226.7
U.S. | Crude Oil
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance	343.4			328.5	500.1
Revisions of previous estimates	29.0			35.6	(146.6)
Improved recovery	5.3
Extensions and discoveries	20.6			18.2	19.5
Purchases of properties	5.0			1.6
Sales of properties	(4.4)			0.0	(1.7)
Production	(41.9)			(40.4)	(42.8)
Proved developed and undeveloped reserves, ending balance	357.0			343.4	328.5
U.S. | Net crude oil and condensate revenue | Crude Oil
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance	255.0			240.6	377.8
Revisions of previous estimates	19.9			31.1	(116.8)
Improved recovery	4.7
Extensions and discoveries	16.1			13.5	14.5
Purchases of properties	4.2			1.3
Sales of properties	(3.6)				(1.5)
Production	(32.7)			(31.5)	(33.4)
Proved developed and undeveloped reserves, ending balance	263.6			255.0	240.6
Proved developed reserves	194.4	194.4	194.4	174.9	161.4	205.0
Proved undeveloped reserves	69.2	69.2	69.2	80.0	79.2	172.8
U.S. | Net natural gas liquids revenue
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance	35.1			34.6	52.8
Revisions of previous estimates	3.9			1.4	(17.1)
Improved recovery | MMcf			0.2
Extensions and discoveries	1.9			2.4	2.7
Purchases of properties	0.3			0.1
Sales of properties	(0.2)				(0.1)
Production	(3.6)			(3.4)	(3.7)
Proved developed and undeveloped reserves, ending balance	37.6	74.9		35.1	34.6
Proved developed reserves	27.4	27.4	27.4	25.6	25.5	26.2
Proved undeveloped reserves	10.2	10.2	10.2	9.5	9.1	26.6
U.S. | Net natural gas revenue
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance | ft³		320.3		319.5	416.8
Revisions of previous estimates | ft³		30.7		18.7	(76.2)
Improved recovery | MMcf			2,600.0
Extensions and discoveries | ft³		15.7		13.5	14.0
Purchases of properties | ft³		2.9		1.5
Sales of properties		(3.6)		0.0	(0.7)
Production | ft³		(33.7)		(32.8)	(34.4)
Proved developed and undeveloped reserves, ending balance | ft³		334.9		320.3	319.5
Proved developed reserves | ft³	254.1	254.1	254.1	248.1	260.2	253.1
Proved undeveloped reserves | ft³	80.8	80.8	80.8	72.2	59.3	163.7
Canada
Proved developed and undeveloped oil reserves:
Proved developed reserves	171.3	171.3	171.3	176.8	180.5	198.1
Proved undeveloped reserves	186.5	186.5	186.5	196.0	205.9	126.0
Canada | Crude Oil
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance	372.8			386.4	324.1
Revisions of previous estimates	(52.8)			(89.3)	(47.3)
Improved recovery	0.0
Extensions and discoveries	59.5			91.3	130.7
Purchases of properties	0.0			5.8
Sales of properties	0.0			(0.7)	0.0
Production	(21.7)			(20.6)	(21.1)
Proved developed and undeveloped reserves, ending balance	357.8			372.8	386.4
Canada | Net crude oil and condensate revenue | Crude Oil
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance	35.9			25.9	45.3
Revisions of previous estimates	3.3			7.5	(19.8)
Improved recovery	0.0
Extensions and discoveries	2.8			0.6	5.1
Purchases of properties	0.0			5.2
Sales of properties	0.0				0.0
Production	(2.5)			(3.3)	(4.7)
Proved developed and undeveloped reserves, ending balance	39.5			35.9	25.9
Proved developed reserves	14.2	14.2	14.2	16.0	18.4	25.1
Proved undeveloped reserves	25.3	25.3	25.3	19.8	7.5	20.2
Canada | Net natural gas liquids revenue
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance	3.3			3.6	3.3
Revisions of previous estimates	0.5			0.0	0.7
Improved recovery | MMcf			0.0
Extensions and discoveries	0.6			0.1	0.1
Purchases of properties	0.0			0.0
Sales of properties	0.0				0.0
Production	(0.3)			(0.4)	(0.5)
Proved developed and undeveloped reserves, ending balance	4.1	43.5		3.3	3.6
Proved developed reserves	2.3	2.3	2.3	2.8	3.2	1.9
Proved undeveloped reserves	1.8	1.8	1.8	0.5	0.4	1.4
Canada | Net natural gas revenue
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance | ft³		2,001.8		2,141.5	1,652.9
Revisions of previous estimates | ft³		(340.5)		(581.0)	(169.2)
Improved recovery | MMcf			0.0
Extensions and discoveries | ft³		336.7		543.2	753.2
Purchases of properties | ft³		0.0		3.9
Sales of properties		0.0		(4,400.0)	0.0
Production | ft³		(113.2)		(101.4)	(95.4)
Proved developed and undeveloped reserves, ending balance | ft³		1,884.8		2,001.8	2,141.5
Proved developed reserves | ft³	928.8	928.8	928.8	947.7	953.6	1,026.7
Proved undeveloped reserves | ft³	956.0	956.0	956.0	1,054.1	1,187.9	626.2
Other
Proved developed and undeveloped oil reserves:
Proved developed reserves	0.5	0.5	0.5	0.6	0.0	0.8
Proved undeveloped reserves	0.1	0.1	0.1	0.1	0.0	0.0
Other | Crude Oil
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance	0.7			0.0	0.8
Revisions of previous estimates	0.2			0.8	(0.8)
Improved recovery	0.0
Extensions and discoveries	0.0			0.0	0.0
Purchases of properties	0.0			0.0
Sales of properties	0.0			0.0	0.0
Production	(0.3)			(0.1)	0.0
Proved developed and undeveloped reserves, ending balance	0.6			0.7	0.0
Other | Net crude oil and condensate revenue | Crude Oil
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance	0.6			0.0	0.8
Revisions of previous estimates	0.2			0.7	(0.8)
Improved recovery	0.0
Extensions and discoveries	0.0			0.0	0.0
Purchases of properties	0.0			0.0
Sales of properties	0.0				0.0
Production	(0.3)			(0.1)	0.0
Proved developed and undeveloped reserves, ending balance	0.5			0.6	0.0
Proved developed reserves	0.4	0.4	0.4	0.5	0.0	0.8
Proved undeveloped reserves	0.1	0.1	0.1	0.1	0.0	0.0
Other | Net natural gas liquids revenue
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance	0.0			0.0	0.0
Revisions of previous estimates	0.0			0.0	0.0
Improved recovery | MMcf			0.0
Extensions and discoveries	0.0			0.0	0.0
Purchases of properties	0.0			0.0
Sales of properties	0.0				0.0
Production	0.0			0.0	0.0
Proved developed and undeveloped reserves, ending balance	0.0			0.0	0.0
Proved developed reserves	0.0	0.0	0.0	0.0	0.0	0.0
Proved undeveloped reserves	0.0	0.0	0.0	0.0	0.0	0.0
Other | Net natural gas revenue
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance | ft³		0.2		0.0	0.0
Revisions of previous estimates | ft³		0.0		0.2	0.0
Improved recovery | MMcf			0.0
Extensions and discoveries | ft³		0.0		0.0	0.0
Purchases of properties | ft³		0.0		0.0
Sales of properties		0.0		0.0	0.0
Production | ft³		0.0		0.0	0.0
Proved developed and undeveloped reserves, ending balance | ft³		0.2		0.2	0.0
Proved developed reserves | ft³	0.2	0.2	0.2	0.2	0.0	0.0
Proved undeveloped reserves | ft³	0.0	0.0	0.0	0.0	0.0	0.0