Supplemental Oil and Gas Disclosures (Unaudited) (Summary of Changes in Reserves - United States) (Details) Mcf in Millions	12 Months Ended
	Dec. 31, 2021 Mcfe bbl Mcf	Dec. 31, 2020 Mcfe Mcf bbl	Dec. 31, 2019 Mcfe Mcf bbl	Dec. 31, 2019 Mcfe bbl Mcf	Dec. 31, 2019 Mcfe Mcf bbl
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]
Proved reserves, beginning of period, (bcfe) | Mcfe	11,990,000,000	12,721,000,000			11,921,000,000
Revisions of previous estimates due to price | Mcfe	415,000,000	(4,370,000,000)			(717,000,000)
Extensions, discoveries and other additions | Mcfe	3,962,000,000	741,000,000			1,195,000,000
Production | Mcfe	(1,240,000,000)	(880,000,000)			(778,000,000)
Acquisition of reserves in place | Mcfe	5,753,000,000	2,354,000,000			0
Disposition of reserves in place | Mcfe	(1,000,000)	0			(2,000,000)
Proved reserves, end of period, (bcfe) | Mcfe	21,148,000,000	11,990,000,000			12,721,000,000
Proved undeveloped reserves:
Proved undeveloped reverses (energy) | Mcfe	0	2,437,000,000	929,000,000	929,000,000	929,000,000
United States
Proved Developed and Undeveloped Reserves [Roll Forward]
Acquisition of reserves in place			0	0
Proved Developed and Undeveloped Reserve (Energy) [Roll Forward]
Proved reserves, beginning of period, (bcfe) | Mcfe	11,990,000,000	12,721,000,000			11,921,000,000
Revisions of previous estimates due to price | Mcfe	415,000,000	(4,370,000,000)			(717,000,000)
Revisions of previous estimates other than price | Mcfe	269,000,000	1,424,000,000			1,102,000,000
Extensions, discoveries and other additions | Mcfe	3,962,000,000	741,000,000			1,195,000,000
Production | Mcfe	(1,240,000,000)	(880,000,000)			(778,000,000)
Acquisition of reserves in place | Mcfe	5,753,000,000	2,354,000,000			0
Disposition of reserves in place | Mcfe	(1,000,000)	0			(2,000,000)
Proved reserves, end of period, (bcfe) | Mcfe	21,148,000,000	11,990,000,000			12,721,000,000
Proved developed reserves as of:
Proved developed reserves (energy) | Mcfe	11,335,000,000	8,203,000,000	6,421,000,000	6,421,000,000	6,421,000,000
Proved undeveloped reserves:
Proved undeveloped reverses (energy) | Mcfe	9,813,000,000	3,787,000,000	6,300,000,000	6,300,000,000	6,300,000,000
United States | Natural Gas
Proved Developed and Undeveloped Reserves [Roll Forward]
Proved reserves, beginning of year | Mcf	9,181	8,630	8,044
Revisions of previous estimates due to price | Mcf	501	(2,143)	(480)
Revisions of previous estimates other than price | Mcf	248	763	685
Extensions, discoveries and other additions | Mcf	2,543	714	992
Production | Mcf	(1,015)	(694)	(609)
Acquisition of reserves in place | Mcf	5,750	1,911
Disposition of reserves in place | Mcf	(1)	0	(2)
Proved reserves, end of year | Mcf	17,207	9,181	8,630
Proved developed reserves as of:
Proved developed reserves (volume) | Mcf	9,308	6,342	4,906	4,906	4,906
Proved undeveloped reserves:
Proved undeveloped reserves (volume) | Mcf	7,899	2,839	3,724	3,724	3,724
United States | Oil
Proved Developed and Undeveloped Reserves [Roll Forward]
Proved reserves, beginning of year	58,024,000	72,925,000		69,007,000
Revisions of previous estimates due to price	1,414,000	(32,507,000)		(2,041,000)
Revisions of previous estimates other than price	1,900,000	3,816,000		3,707,000
Extensions, discoveries and other additions	24,865,000	135,000		6,948,000
Production	(6,610,000)	(5,141,000)		(4,696,000)
Acquisition of reserves in place	247,000	18,796,000
Disposition of reserves in place	(61,000)	0		0
Proved reserves, end of year	79,779,000	58,024,000		72,925,000
Proved developed reserves as of:
Proved developed reserves (volume)	40,930,000	33,563,000	26,124,000	26,124,000	26,124,000
Proved undeveloped reserves:
Proved undeveloped reserves (volume)	38,849,000	24,461,000	46,801,000	46,801,000	46,801,000
United States | NGL
Proved Developed and Undeveloped Reserves [Roll Forward]
Proved reserves, beginning of year	410,151,000	608,761,000		577,063,000
Revisions of previous estimates due to price	(15,525,000)	(338,639,000)		(37,492,000)
Revisions of previous estimates other than price	1,500,000	106,444,000		65,869,000
Extensions, discoveries and other additions	211,598,000	4,371,000		26,941,000
Production	(30,940,000)	(25,927,000)		(23,620,000)
Acquisition of reserves in place	180,000	55,141,000
Disposition of reserves in place	0	0		0
Proved reserves, end of year	576,964,000	410,151,000		608,761,000
Proved developed reserves as of:
Proved developed reserves (volume)	296,832,000	276,548,000	226,271,000	226,271,000	226,271,000
Proved undeveloped reserves:
Proved undeveloped reserves (volume)	280,132,000	133,603,000	382,490,000	382,490,000	382,490,000