CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
REVENUES:
Revenues	$ 2,255	$ 2,281	$ 4,744	$ 5,034
OPERATING EXPENSES:
Oil, natural gas and NGL production	138	140	285	275
Oil, natural gas and NGL gathering, processing and transportation	340	357	696	712
Production taxes	26	21	57	43
General and administrative	91	70	163	135
Restructuring and other termination costs	0	0	38	0
Provision for legal contingencies, net	4	17	9	15
Oil, natural gas and NGL depreciation, depletion and amortization	271	202	539	399
Depreciation and amortization of other assets	19	21	37	42
Impairments	46	0	46	0
Other operating (income) expense	(1)	26	(1)	417
Net (gains) losses on sales of fixed assets	(1)	1	7	1
Total Operating Expenses	2,225	1,882	4,436	4,394
INCOME FROM OPERATIONS	30	399	308	640
OTHER INCOME (EXPENSE):
Interest expense	(117)	(93)	(240)	(188)
Gains on investments	0	0	139	0
Gains on purchases or exchanges of debt	0	191	0	184
Other income (expense)	62	(1)	62	2
Total Other Income (Expense)	(55)	97	(39)	(2)
INCOME (LOSS) BEFORE INCOME TAXES	(25)	496	269	638
Income tax expense (benefit)	(9)	1	(9)	2
NET INCOME (LOSS)	(16)	495	278	636
Net income attributable to noncontrolling interests	(1)	(1)	(2)	(2)
NET INCOME (LOSS) ATTRIBUTABLE TO CHESAPEAKE	(17)	494	276	634
Preferred stock dividends	(23)	(16)	(46)	(39)
Loss on exchange of preferred stock	0	0	0	(41)
Earnings allocated to participating securities	0	(8)	(2)	(7)
NET INCOME (LOSS) AVAILABLE TO COMMON STOCKHOLDERS	$ (40)	$ 470	$ 228	$ 547
EARNINGS (LOSS) PER COMMON SHARE:
Earnings per common share, basic (in dollars per share)	$ (0.04)	$ 0.52	$ 0.25	$ 0.60
Earnings per common share, diluted (in dollars per share)	$ (0.04)	$ 0.47	$ 0.25	$ 0.59
WEIGHTED AVERAGE COMMON AND COMMON EQUIVALENT SHARES OUTSTANDING (in millions):
Weighted average common and common equivalent shares outstanding, basic (in shares)	909	908	908	907
Weighted average common and common equivalent shares outstanding, diluted (in shares)	909	1,114	908	1,053
Oil, natrual gas and NGL [Member]
REVENUES:
Revenues	$ 982	$ 1,279	$ 2,225	$ 2,748
Marketing [Member]
REVENUES:
Revenues	1,273	1,002	2,519	2,286
OPERATING EXPENSES:
Marketing	$ 1,292	$ 1,027	$ 2,560	$ 2,355