Condensed Combined Debtor-in-Possession Financial Information - Condensed Consolidated Statement of Operations (Details) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
REVENUES AND OTHER:
Revenues	$ 521	$ 2,386	$ 3,062	$ 4,582
Gains on sales of assets	0	1	0	20
OPERATING EXPENSES:
Severance and ad valorem taxes	25	62	79	113
General and administrative	112	89	177	192
Separation and other termination costs	22	0	27	0
Provision for legal contingencies, net	7	3	8	3
Depreciation, depletion and amortization	158	580	761	1,099
Impairments	0	1	8,522	2
Other operating expense	5	3	88	64
Total Operating Expenses	1,062	2,108	11,830	4,486
INCOME (LOSS) FROM OPERATIONS	(541)	278	(8,768)	96
OTHER INCOME (EXPENSE):
Interest expense	(137)	(175)	(282)	(336)
Losses on investments	0	(23)	(23)	(24)
Gains on purchases or exchanges of debt	2	0	65	0
Other income	6	18	12	27
Reorganization items, net	394	0	394	0
Total Other Income (Expense)	265	(180)	166	(333)
INCOME (LOSS) BEFORE INCOME TAXES	(276)	98	(8,602)	(237)
INCOME TAX (BENEFIT) EXPENSE	0	0	(13)	(314)
NET INCOME (LOSS)	(276)	98	(8,589)	77
Other comprehensive income	8	8	17	18
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO CHESAPEAKE	(268)	106	(8,556)	95
Oil, natural gas and NGL
REVENUES AND OTHER:
Revenues	267	1,454	2,068	2,383
Marketing
REVENUES AND OTHER:
Revenues	240	916	964	2,149
OPERATING EXPENSES:
Expense	242	940	988	2,170
Oil, natural gas and NGL and Marketing
REVENUES AND OTHER:
Revenues	507	2,370	3,032	4,532
Other
REVENUES AND OTHER:
Revenues	14	15	30	30
Oil, natural gas and NGL production
OPERATING EXPENSES:
Expense	91	144	213	259
Oil, natural gas and NGL gathering, processing and transportation
OPERATING EXPENSES:
Expense	270	271	555	545
Exploration
OPERATING EXPENSES:
Expense	130	15	412	39
Debtor-in-Possession
REVENUES AND OTHER:
Revenues	519	2,383	3,058	4,575
Gains on sales of assets	0	1	0	20
OPERATING EXPENSES:
Severance and ad valorem taxes	25	62	79	113
General and administrative	111	88	176	191
Separation and other termination costs	22	0	27	0
Provision for legal contingencies, net	7	3	8	3
Depreciation, depletion and amortization	157	578	759	1,096
Impairments	0	1	8,489	2
Other operating expense	5	3	88	64
Total Operating Expenses	1,059	2,104	11,792	4,479
INCOME (LOSS) FROM OPERATIONS	(540)	279	(8,734)	96
OTHER INCOME (EXPENSE):
Interest expense	(137)	(175)	(282)	(336)
Losses on investments	0	(23)	(23)	(24)
Gains on purchases or exchanges of debt	2	0	65	0
Other income	6	18	12	27
Reorganization items, net	394	0	394	0
Equity in net earnings of subsidiary	(1)	(1)	(18)	0
Total Other Income (Expense)	264	(181)	148	(333)
INCOME (LOSS) BEFORE INCOME TAXES	(276)	98	(8,586)	(237)
INCOME TAX (BENEFIT) EXPENSE	0	0	(13)	(314)
NET INCOME (LOSS)	(276)	98	(8,573)	77
Other comprehensive income	8	8	17	18
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO CHESAPEAKE	(268)	106	(8,556)	95
Debtor-in-Possession | Oil, natural gas and NGL
REVENUES AND OTHER:
Revenues	265	1,451	2,064	2,376
Debtor-in-Possession | Marketing
REVENUES AND OTHER:
Revenues	240	916	964	2,149
OPERATING EXPENSES:
Expense	242	940	988	2,170
Debtor-in-Possession | Oil, natural gas and NGL and Marketing
REVENUES AND OTHER:
Revenues	505	2,367	3,028	4,525
Debtor-in-Possession | Other
REVENUES AND OTHER:
Revenues	14	15	30	30
Debtor-in-Possession | Oil, natural gas and NGL production
OPERATING EXPENSES:
Expense	91	144	213	259
Debtor-in-Possession | Oil, natural gas and NGL gathering, processing and transportation
OPERATING EXPENSES:
Expense	269	270	553	542
Debtor-in-Possession | Exploration
OPERATING EXPENSES:
Expense	$ 130	$ 15	$ 412	$ 39