CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
NET INCOME	$ 1,037	$ 510	$ 1,033	$ 347
Other comprehensive income, net of income tax:
Gain (loss) on derivative instruments, net of income taxes of ($2) million, $87 million, $0 and $89 million	(3)	141		146
Reclassification of gain on settled derivative instruments, net of income taxes of ($6) million, ($11) million, ($7) million and ($39) million	(11)	(18)	(12)	(64)
Ineffective portion of derivatives designated as cash flow hedges, net of income taxes of $0, ($3) million, $0 and ($7) million		(5)		(11)
Unrealized gain (loss) on available-for-sale securities, net of income taxes of ($6) million, ($3) million, ($2) million and ($1) million	(9)	(5)	(3)	(2)
Other comprehensive income (loss)	(23)	113	(15)	69
Comprehensive income	1,014	623	1,018	416
Comprehensive income attributable to noncontrolling interests	(65)		(89)
COMPREHENSIVE INCOME ATTRIBUTABLE TO CHESAPEAKE	$ 949	$ 623	$ 929	$ 416