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, 2023 MMBbls ft³	Dec. 31, 2023 ft³ MMBbls	Dec. 31, 2022 MMBbls ft³ MMcf	Dec. 31, 2021 ft³ MMBbls	Dec. 31, 2020 ft³ MMBbls
Proved developed and undeveloped oil reserves:
Proved developed reserves	425.5	425.5	436.0	419.2	410.8
Proved undeveloped reserves	314.0	314.0	279.4	297.7	304.1
Crude Oil
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance	715.4		716.9	714.9
Revisions of previous estimates	(13.3)		(23.6)	(52.9)
Improved recovery	0.4		5.3
Extensions and discoveries	112.6		80.1	109.4
Purchases of properties			5.0	7.4
Sales of properties	(5.2)		(4.4)	(0.7)
Production	(70.4)		(63.9)	(61.1)
Proved developed and undeveloped reserves, ending balance	739.5		715.4	716.9
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	303.6		291.5	266.5
Revisions of previous estimates	(10.8)		23.4	39.3
Improved recovery	0.4		4.7
Extensions and discoveries	22.5		18.9	14.1
Purchases of properties			4.2	6.4
Sales of properties	(2.0)		(3.6)
Production	(37.9)		(35.5)	(34.9)
Proved developed and undeveloped reserves, ending balance	275.8		303.6	291.5
Proved developed reserves	186.3	186.3	209.0	191.5	179.8
Proved undeveloped reserves	89.5	89.5	94.6	99.9	86.7
Net natural gas liquids revenue
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance	41.7		38.4	38.2
Revisions of previous estimates	(1.4)		4.4	1.4
Improved recovery			0.2
Extensions and discoveries	2.0		2.5	2.5
Purchases of properties			0.3	0.1
Sales of properties	(0.6)		(0.2)
Production	(4.1)		(3.9)	(3.8)
Proved developed and undeveloped reserves, ending balance	37.6		41.7	38.4
Proved developed reserves	25.9	25.9	29.7	28.4	28.7
Proved undeveloped reserves	11.7	11.7	12.0	10.0	9.5
Net natural gas revenue
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance | ft³		2,219.9	2,322.3	2,461.0
Revisions of previous estimates | ft³		(6.9)	(309.8)	(562.1)
Improved recovery | ft³			2.6
Extensions and discoveries | ft³		528.9	352.4	556.7
Purchases of properties | ft³			2.9	5.4
Sales of properties		(15.6)	(3,600.0)	(4.4)
Production | ft³		(170.1)	(146.9)	(134.2)
Proved developed and undeveloped reserves, ending balance | ft³		2,556.2	2,219.9	2,322.3
Proved developed reserves | ft³	1,279.3	1,279.3	1,183.1	1,196.0	1,213.8
Proved undeveloped reserves | ft³	1,276.9	1,276.9	1,036.8	1,126.4	1,247.2
MP Gulf of Mexico LLC
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped reserves, ending balance	15.5
Proved developed reserves	12.8	12.8
Proved undeveloped reserves	2.7	2.7
MP Gulf of Mexico LLC | Net crude oil and condensate revenue
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped reserves, ending balance	14.0
Proved developed reserves	11.7	11.7
Proved undeveloped reserves	2.3	2.3
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	1.2
Proved developed reserves	0.5	0.5
Proved undeveloped reserves	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		5.3
Proved developed reserves | ft³	3.8	3.8
Proved undeveloped reserves | ft³	1.5	1.5
U.S.
Proved developed and undeveloped oil reserves:
Proved developed reserves	223.2	223.2	264.2	241.9	230.3
Proved undeveloped reserves	87.9	87.9	92.8	101.6	98.2
U.S. | Crude Oil
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance	357.0		343.4	328.5
Revisions of previous estimates	(13.3)		29.0	35.6
Improved recovery			5.3
Extensions and discoveries	12.7		20.6	18.2
Purchases of properties			5.0	1.6
Sales of properties	0.0		(4.4)	0.0
Production	(45.3)		(41.9)	(40.4)
Proved developed and undeveloped reserves, ending balance	311.1		357.0	343.4
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	263.6		255.0	240.6
Revisions of previous estimates	(8.9)		19.9	31.1
Improved recovery	0.0		4.7
Extensions and discoveries	8.9		16.1	13.5
Purchases of properties			4.2	1.3
Sales of properties	0.0		(3.6)
Production	(35.6)		(32.7)	(31.5)
Proved developed and undeveloped reserves, ending balance	228.0		263.6	255.0
Proved developed reserves	163.7	163.7	194.4	174.9	161.4
Proved undeveloped reserves	64.3	64.3	69.2	80.0	79.2
U.S. | Net natural gas liquids revenue
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance	37.6		35.1	34.6
Revisions of previous estimates	(1.2)		3.9	1.4
Improved recovery			0.2
Extensions and discoveries	1.7		1.9	2.4
Purchases of properties			0.3	0.1
Sales of properties	0.0		(0.2)
Production	(3.8)		(3.6)	(3.4)
Proved developed and undeveloped reserves, ending balance	34.3	71.3	37.6	35.1
Proved developed reserves	24.1	24.1	27.4	25.6	25.5
Proved undeveloped reserves	10.2	10.2	10.2	9.5	9.1
U.S. | Net natural gas revenue
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance | ft³		334.9	320.3	319.5
Revisions of previous estimates | ft³		(19.0)	30.7	18.7
Improved recovery | ft³			2.6
Extensions and discoveries | ft³		12.3	15.7	13.5
Purchases of properties | ft³			2.9	1.5
Sales of properties		0.0	(3,600.0)	0.0
Production | ft³		(35.1)	(33.7)	(32.8)
Proved developed and undeveloped reserves, ending balance | ft³		293.1	334.9	320.3
Proved developed reserves | ft³	212.4	212.4	254.1	248.1	260.2
Proved undeveloped reserves | ft³	80.7	80.7	80.8	72.2	59.3
Canada
Proved developed and undeveloped oil reserves:
Proved developed reserves	202.0	202.0	171.3	176.8	180.5
Proved undeveloped reserves	213.5	213.5	186.5	196.0	205.9
Canada | Crude Oil
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance	357.8		372.8	386.4
Revisions of previous estimates	0.2		(52.8)	(89.3)
Improved recovery	0.4		0.0
Extensions and discoveries	87.3		59.5	91.3
Purchases of properties			0.0	5.8
Sales of properties	(5.2)		0.0	(0.7)
Production	(25.0)		(21.7)	(20.6)
Proved developed and undeveloped reserves, ending balance	415.5		357.8	372.8
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	39.5		35.9	25.9
Revisions of previous estimates	(1.8)		3.3	7.5
Improved recovery	0.4		0.0
Extensions and discoveries	1.5		2.8	0.6
Purchases of properties			0.0	5.2
Sales of properties	(2.0)		0.0
Production	(2.2)		(2.5)	(3.3)
Proved developed and undeveloped reserves, ending balance	35.4		39.5	35.9
Proved developed reserves	22.3	22.3	14.2	16.0	18.4
Proved undeveloped reserves	13.1	13.1	25.3	19.8	7.5
Canada | Net natural gas liquids revenue
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance	4.1		3.3	3.6
Revisions of previous estimates	(0.2)		0.5	0.0
Improved recovery			0.0
Extensions and discoveries	0.3		0.6	0.1
Purchases of properties			0.0	0.0
Sales of properties	(0.6)		0.0
Production	(0.3)		(0.3)	(0.4)
Proved developed and undeveloped reserves, ending balance	3.3	41.9	4.1	3.3
Proved developed reserves	1.8	1.8	2.3	2.8	3.2
Proved undeveloped reserves	1.5	1.5	1.8	0.5	0.4
Canada | Net natural gas revenue
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance | ft³		1,884.8	2,001.8	2,141.5
Revisions of previous estimates | ft³		12.1	(340.5)	(581.0)
Improved recovery | ft³			0.0
Extensions and discoveries | ft³		513.8	336.7	543.2
Purchases of properties | ft³			0.0	3.9
Sales of properties		(15.6)	0.0	(4.4)
Production | ft³		(135.0)	(113.2)	(101.4)
Proved developed and undeveloped reserves, ending balance | ft³		2,260.1	1,884.8	2,001.8
Proved developed reserves | ft³	1,066.7	1,066.7	928.8	947.7	953.6
Proved undeveloped reserves | ft³	1,193.4	1,193.4	956.0	1,054.1	1,187.9
Other
Proved developed and undeveloped oil reserves:
Proved developed reserves	0.3	0.3	0.5	0.6	0.0
Proved undeveloped reserves	12.6	12.6	0.1	0.1	0.0
Other | Crude Oil
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance	0.6		0.7	0.0
Revisions of previous estimates	(0.2)		0.2	0.8
Improved recovery	0.0		0.0
Extensions and discoveries	12.6		0.0	0.0
Purchases of properties			0.0	0.0
Sales of properties	0.0		0.0	0.0
Production	(0.1)		(0.3)	(0.1)
Proved developed and undeveloped reserves, ending balance	12.9		0.6	0.7
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	0.5		0.6	0.0
Revisions of previous estimates	(0.1)		0.2	0.7
Improved recovery	0.0		0.0
Extensions and discoveries	12.1		0.0	0.0
Purchases of properties			0.0	0.0
Sales of properties	0.0		0.0
Production	(0.1)		(0.3)	(0.1)
Proved developed and undeveloped reserves, ending balance	12.4		0.5	0.6
Proved developed reserves	0.3	0.3	0.4	0.5	0.0
Proved undeveloped reserves	12.1	12.1	0.1	0.1	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			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	2.8	0.0	0.0
Proved developed reserves	0.0	0.0	0.0	0.0	0.0
Proved undeveloped reserves	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	0.2	0.0
Revisions of previous estimates | ft³		0.0	0.0	0.2
Improved recovery | ft³			0.0
Extensions and discoveries | ft³		2.8	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		3.0	0.2	0.2
Proved developed reserves | ft³	0.2	0.2	0.2	0.2	0.0
Proved undeveloped reserves | ft³	2.8	2.8	0.0	0.0	0.0