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Revenue - Disaggregated Revenue (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		8 Months Ended	9 Months Ended
	Feb. 09, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Total revenues and other	$ 260	$ 890	$ 960	$ 2,463	$ 3,992
Oil, natural gas and NGL revenue
Disaggregation of Revenue [Line Items]
Revenue	398	1,170	672	2,615	2,006
Marketing revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue					1,344
Other marketing revenue
Disaggregation of Revenue [Line Items]
Revenue					68
Marketing
Disaggregation of Revenue [Line Items]
Revenue	239	627	448	1,443	1,412
Appalachia
Disaggregation of Revenue [Line Items]
Revenue	119	383	137	772	445
Gulf Coast
Disaggregation of Revenue [Line Items]
Revenue	53	207	92	401	245
South Texas
Disaggregation of Revenue [Line Items]
Revenue	122	312	241	761	675
Brazos Valley
Disaggregation of Revenue [Line Items]
Revenue	71	175	133	456	394
Powder River Basin
Disaggregation of Revenue [Line Items]
Revenue	33	93	47	225	175
Mid-Continent
Disaggregation of Revenue [Line Items]
Revenue			22		72
Oil | Oil, natural gas and NGL revenue
Disaggregation of Revenue [Line Items]
Revenue	179	437	366	1,115	1,091
Oil | Marketing revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue					930
Oil | Other marketing revenue
Disaggregation of Revenue [Line Items]
Revenue					67
Oil | Marketing
Disaggregation of Revenue [Line Items]
Revenue	141	326	301	828	997
Oil | Appalachia
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0	0
Oil | Gulf Coast
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0	0
Oil | South Texas
Disaggregation of Revenue [Line Items]
Revenue	92	221	189	562	539
Oil | Brazos Valley
Disaggregation of Revenue [Line Items]
Revenue	67	158	127	409	375
Oil | Powder River Basin
Disaggregation of Revenue [Line Items]
Revenue	20	58	36	144	133
Oil | Mid-Continent
Disaggregation of Revenue [Line Items]
Revenue			14		44
Natural Gas | Oil, natural gas and NGL revenue
Disaggregation of Revenue [Line Items]
Revenue	196	664	270	1,351	824
Natural Gas | Marketing revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue					338
Natural Gas | Other marketing revenue
Disaggregation of Revenue [Line Items]
Revenue					1
Natural Gas | Marketing
Disaggregation of Revenue [Line Items]
Revenue	78	240	116	483	339
Natural Gas | Appalachia
Disaggregation of Revenue [Line Items]
Revenue	119	383	137	772	445
Natural Gas | Gulf Coast
Disaggregation of Revenue [Line Items]
Revenue	53	207	92	401	245
Natural Gas | South Texas
Disaggregation of Revenue [Line Items]
Revenue	15	44	26	97	77
Natural Gas | Brazos Valley
Disaggregation of Revenue [Line Items]
Revenue	2	9	3	30	10
Natural Gas | Powder River Basin
Disaggregation of Revenue [Line Items]
Revenue	7	21	7	51	28
Natural Gas | Mid-Continent
Disaggregation of Revenue [Line Items]
Revenue			5		19
NGL | Oil, natural gas and NGL revenue
Disaggregation of Revenue [Line Items]
Revenue	23	69	36	149	91
NGL | Marketing revenue from contracts with customers
Disaggregation of Revenue [Line Items]
Revenue					76
NGL | Other marketing revenue
Disaggregation of Revenue [Line Items]
Revenue					0
NGL | Marketing
Disaggregation of Revenue [Line Items]
Revenue	20	61	31	132	76
NGL | Appalachia
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0	0
NGL | Gulf Coast
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0	0
NGL | South Texas
Disaggregation of Revenue [Line Items]
Revenue	15	47	26	102	59
NGL | Brazos Valley
Disaggregation of Revenue [Line Items]
Revenue	2	8	3	17	9
NGL | Powder River Basin
Disaggregation of Revenue [Line Items]
Revenue	$ 6	$ 14	4	$ 30	14
NGL | Mid-Continent
Disaggregation of Revenue [Line Items]
Revenue			$ 3		$ 9

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