Acquisitions (Tables) (Chesapeake Property Acquisition [Member])

12 Months Ended

Dec. 31, 2014

Chesapeake Property Acquisition [Member]

Business Acquisition [Line Items]

Summary Of Consideration Paid And Fair Value Of Assets Acquired And Liabilities Assumed

		For the year ended December 31, 2014
Consideration:		(in millions)
Cash	$	4,978
Recognized amounts of identifiable assets acquired and liabilities assumed:
Assets acquired:
Proved natural gas and oil properties		1,424
Unproved natural gas and oil properties		3,605
Other property and equipment		19
Inventory		2
Other receivables		27
Total assets acquired		5,077
Liabilities assumed:
Asset retirement obligations		(42)
Other long term liabilities		(57)
Total liabilities assumed		(99)
	$	4,978

Summary Of Consolidated Results Of Operations On Pro Forma Basis

	For the year ended
	December 31,
	2014		2013
	(in millions) (unaudited)
Revenues	$	4,440	$	3,713
Net Income		927		684