CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
REVENUES:
Revenues	$ 2,418	$ 1,943	$ 7,162	$ 6,977
OPERATING EXPENSES:
Oil, natural gas and NGL production	132	151	417	426
Oil, natural gas and NGL gathering, processing and transportation	364	369	1,060	1,081
Production taxes	34	21	91	64
General and administrative	66	54	229	189
Restructuring and other termination costs	0	0	38	0
Provision for legal contingencies, net	8	20	17	35
Oil, natural gas and NGL depreciation, depletion and amortization	274	228	813	627
Depreciation and amortization of other assets	17	20	54	62
Impairments	5	3	51	3
Other operating (income) expense	0	6	(1)	423
Net (gains) losses on sales of fixed assets	0	(1)	7	0
Total Operating Expenses	2,138	1,849	6,574	6,243
INCOME FROM OPERATIONS	280	94	588	734
OTHER INCOME (EXPENSE):
Interest expense	(127)	(114)	(367)	(302)
Gains on investments	0	0	139	0
Gains (losses) on purchases or exchanges of debt	(68)	(1)	(68)	183
Other income	1	4	63	6
Total Other Expense	(194)	(111)	(233)	(113)
INCOME (LOSS) BEFORE INCOME TAXES	86	(17)	355	621
Income tax expense (benefit)	1	0	(8)	2
NET INCOME (LOSS)	85	(17)	363	619
Net income attributable to noncontrolling interests	(1)	(1)	(3)	(3)
NET INCOME (LOSS) ATTRIBUTABLE TO CHESAPEAKE	84	(18)	360	616
Preferred stock dividends	(23)	(23)	(69)	(62)
Loss on exchange of preferred stock	0	0	0	(41)
Earnings allocated to participating securities	(1)	0	(3)	(7)
NET INCOME (LOSS) AVAILABLE TO COMMON STOCKHOLDERS	$ 60	$ (41)	$ 288	$ 506
EARNINGS (LOSS) PER COMMON SHARE:
Earnings per common share, basic (in dollars per share)	$ 0.07	$ (0.05)	$ 0.32	$ 0.56
Earnings per common share, diluted (in dollars per share)	$ 0.07	$ (0.05)	$ 0.32	$ 0.56
WEIGHTED AVERAGE COMMON AND COMMON EQUIVALENT SHARES OUTSTANDING (in millions):
Weighted average common and common equivalent shares outstanding, basic (in shares)	910	909	909	908
Weighted average common and common equivalent shares outstanding, diluted (in shares)	911	909	909	908
Oil, natrual gas and NGL [Member]
REVENUES:
Revenues	$ 1,199	$ 979	$ 3,424	$ 3,727
Marketing [Member]
REVENUES:
Revenues	1,219	964	3,738	3,250
OPERATING EXPENSES:
Marketing	$ 1,238	$ 978	$ 3,798	$ 3,333