Supplemental Oil and Gas Information (Unaudited) - Summary of Proved Reserves Based on Average Prices (Details) MMBbls in Millions, ft³ in Billions	12 Months Ended
	Dec. 31, 2021 MMBbls ft³	Dec. 31, 2021 ft³ MMBbls	Dec. 31, 2020 MMBbls ft³	Dec. 31, 2019 MMBbls ft³	Dec. 31, 2018 MMBbls ft³
Proved developed and undeveloped oil reserves:
Proved developed reserves	419.2	419.2	410.8	472.3	430.2
Proved undeveloped reserves	297.7	297.7	304.1	352.7	413.8
Crude Oil
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance	714.9		825.0	844.0
Revisions of previous estimates	(52.9)		(194.7)	28.4
Extensions and discoveries	109.4		150.3	73.3
Purchases of properties	7.4			76.2
Sales of properties	(0.7)		(1.7)	(121.5)
Production	(61.1)		(63.9)	(75.4)
Proved developed and undeveloped reserves, ending balance	716.9		714.9	825.0
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	266.5		423.9	432.5
Revisions of previous estimates	39.3		(137.4)	(31.0)
Extensions and discoveries	14.1		19.6	58.2
Purchases of properties	6.4			56.3
Sales of properties				(45.8)
Production	(34.9)		(38.1)	(46.3)
Proved developed and undeveloped reserves, ending balance	291.5		266.5	423.9
Proved developed reserves	191.5	191.5	179.8	230.9	249.3
Proved undeveloped reserves	99.9	99.9	86.7	193.0	183.2
Net natural gas liquids revenue
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance	38.2		56.1	54.2
Revisions of previous estimates	1.4		(16.4)	(5.0)
Extensions and discoveries	2.5		2.8	6.8
Purchases of properties	0.1			5.2
Production	(3.8)		(4.2)	(4.5)
Proved developed and undeveloped reserves, ending balance	38.4		38.2	56.1
Proved developed reserves	28.4	28.4	28.7	28.1	27.3
Proved undeveloped reserves	10.0	10.0	9.5	28.0	26.9
Net natural gas revenue
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance | ft³		2,461.0	2,069.7	2,143.6
Revisions of previous estimates | ft³		(562.2)	(245.4)	386.5
Extensions and discoveries | ft³		556.7	767.2	49.8
Purchases of properties | ft³		5.4		88.3
Sales of properties | ft³		(4.4)		(450.7)
Production | ft³		(134.2)	(129.8)	(147.8)
Proved developed and undeveloped reserves, ending balance | ft³		2,322.3	2,461.0	2,069.7
Proved developed reserves | ft³	1,196.0	1,196.0	1,213.8	1,279.8	921.6
Proved undeveloped reserves | ft³	1,126.4	1,126.4	1,247.2	789.9	1,222.0
MP Gulf of Mexico LLC
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped reserves, ending balance	18.4
Proved developed reserves	16.2	16.2
Proved undeveloped reserves	2.2	2.2
MP Gulf of Mexico LLC | Net crude oil and condensate revenue
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped reserves, ending balance	16.6
Proved developed reserves	14.6	14.6
Proved undeveloped reserves	2.0	2.0
MP Gulf of Mexico LLC | Net natural gas liquids revenue
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped reserves, ending balance	0.7	1.7
Proved developed reserves	0.6	0.6
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		6.1
Proved developed reserves | ft³	5.4	5.4
Proved undeveloped reserves | ft³	0.7	0.7
U.S.
Proved developed and undeveloped oil reserves:
Proved developed reserves	241.9	241.9	230.3	273.4	247.0
Proved undeveloped reserves	101.6	101.6	98.2	226.7	178.7
U.S. | Crude Oil
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance	328.5		500.1	425.6
Revisions of previous estimates	35.6		(146.6)	(17.9)
Extensions and discoveries	18.2		19.5	62.2
Purchases of properties	1.6			76.2
Sales of properties	0.0		(1.7)	(0.1)
Production	(40.4)		(42.8)	(45.9)
Proved developed and undeveloped reserves, ending balance	343.4		328.5	500.1
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	240.6		377.8	326.5
Revisions of previous estimates	31.1		(116.8)	(17.1)
Extensions and discoveries	13.5		14.5	49.2
Purchases of properties	1.3			56.3
Sales of properties				(0.1)
Production	(31.5)		(33.4)	(37.0)
Proved developed and undeveloped reserves, ending balance	255.0		240.6	377.8
Proved developed reserves	174.9	174.9	161.4	205.0	189.0
Proved undeveloped reserves	80.0	80.0	79.2	172.8	137.5
U.S. | Net natural gas liquids revenue
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance	34.6		52.8	47.6
Revisions of previous estimates	1.4		(17.1)	(2.5)
Extensions and discoveries	2.4		2.7	6.4
Purchases of properties	0.1			5.2
Production	(3.4)		(3.7)	(3.9)
Proved developed and undeveloped reserves, ending balance	35.1	78.7	34.6	52.8
Proved developed reserves	25.6	25.6	25.5	26.2	24.9
Proved undeveloped reserves	9.5	9.5	9.1	26.6	22.7
U.S. | Net natural gas revenue
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance | ft³		319.5	416.8	309.0
Revisions of previous estimates | ft³		18.7	(76.2)	10.3
Extensions and discoveries | ft³		13.5	14.0	39.5
Purchases of properties | ft³		1.5		88.3
Sales of properties | ft³		0.0		(0.1)
Production | ft³		(32.8)	(34.4)	(30.2)
Proved developed and undeveloped reserves, ending balance | ft³		320.3	319.5	416.8
Proved developed reserves | ft³	248.1	248.1	260.2	253.1	198.3
Proved undeveloped reserves | ft³	72.2	72.2	59.3	163.7	110.7
Canada
Proved developed and undeveloped oil reserves:
Proved developed reserves	176.8	176.8	180.5	198.1	124.2
Proved undeveloped reserves	196.0	196.0	205.9	126.0	164.5
Canada | Crude Oil
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance	386.4		324.1	288.6
Revisions of previous estimates	(89.3)		(47.3)	46.1
Extensions and discoveries	91.3		130.7	11.1
Purchases of properties	5.8			0.0
Sales of properties	(0.7)		0.0	0.0
Production	(20.6)		(21.1)	(21.7)
Proved developed and undeveloped reserves, ending balance	372.8		386.4	324.1
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	25.9		45.3	55.0
Revisions of previous estimates	7.5		(19.8)	(14.0)
Extensions and discoveries	0.6		5.1	9.0
Purchases of properties	5.2			0.0
Sales of properties				0.0
Production	(3.3)		(4.7)	(4.7)
Proved developed and undeveloped reserves, ending balance	35.9		25.9	45.3
Proved developed reserves	16.0	16.0	18.4	25.1	23.3
Proved undeveloped reserves	19.8	19.8	7.5	20.2	31.7
Canada | Net natural gas liquids revenue
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance	3.6		3.3	5.9
Revisions of previous estimates	0.0		0.7	(2.5)
Extensions and discoveries	0.1		0.1	0.4
Purchases of properties	0.0			0.0
Production	(0.4)		(0.5)	(0.5)
Proved developed and undeveloped reserves, ending balance	3.3	74.0	3.6	3.3
Proved developed reserves	2.8	2.8	3.2	1.9	1.7
Proved undeveloped reserves	0.5	0.5	0.4	1.4	4.2
Canada | Net natural gas revenue
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance | ft³		2,141.5	1,652.9	1,366.4
Revisions of previous estimates | ft³		(581.0)	(169.2)	375.3
Extensions and discoveries | ft³		543.2	753.2	10.3
Purchases of properties | ft³		3.9		0.0
Sales of properties | ft³		(4.4)		0.0
Production | ft³		(101.4)	(95.4)	(99.1)
Proved developed and undeveloped reserves, ending balance | ft³		2,001.8	2,141.5	1,652.9
Proved developed reserves | ft³	947.7	947.7	953.6	1,026.7	595.0
Proved undeveloped reserves | ft³	1,054.1	1,054.1	1,187.9	626.2	771.4
Malaysia and Other
Proved developed and undeveloped oil reserves:
Proved developed reserves	0.6	0.6	0.0	0.8	59.1
Proved undeveloped reserves	0.1	0.1	0.0	0.0	70.7
Malaysia and Other | Crude Oil
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance	0.0		0.8	129.7
Revisions of previous estimates	0.8		(0.8)	0.3
Extensions and discoveries	0.0		0.0	0.0
Purchases of properties	0.0			0.0
Sales of properties	0.0		0.0	(121.4)
Production	(0.1)		0.0	(7.8)
Proved developed and undeveloped reserves, ending balance	0.7		0.0	0.8
Malaysia and 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	0.0		0.8	51.0
Revisions of previous estimates	0.7		(0.8)	0.1
Extensions and discoveries	0.0		0.0	0.0
Purchases of properties	0.0			0.0
Sales of properties				(45.7)
Production	(0.1)		0.0	(4.6)
Proved developed and undeveloped reserves, ending balance	0.6		0.0	0.8
Proved developed reserves	0.5	0.5	0.0	0.8	37.0
Proved undeveloped reserves	0.1	0.1	0.0	0.0	14.0
Malaysia and 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	0.7
Revisions of previous estimates	0.0		0.0	0.0
Extensions and discoveries	0.0		0.0	0.0
Purchases of properties	0.0			0.0
Production	0.0		0.0	(0.1)
Proved developed and undeveloped reserves, ending balance	0.0		0.0	0.0
Proved developed reserves	0.0	0.0	0.0	0.0	0.7
Proved undeveloped reserves	0.0	0.0	0.0	0.0	0.0
Malaysia and Other | Net natural gas revenue
Proved developed and undeveloped oil reserves:
Proved developed and undeveloped crude oil/synthetic oil reserves, beginning balance | ft³		0.0	0.0	468.2
Revisions of previous estimates | ft³		0.2	0.0	0.9
Extensions and discoveries | ft³		0.0	0.0	0.0
Purchases of properties | ft³		0.0		0.0
Sales of properties | ft³		0.0		(450.6)
Production | ft³		0.0	0.0	(18.5)
Proved developed and undeveloped reserves, ending balance | ft³		0.2	0.0	0.0
Proved developed reserves | ft³	0.2	0.2	0.0	0.0	128.3
Proved undeveloped reserves | ft³	0.0	0.0	0.0	0.0	339.9