Consolidated Statements of Cash Flows (unaudited) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash Flows From Operating Activities
Net Income	$ 776	$ 749
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Depreciation, Depletion and Amortization	1,020	681
Asset Impairments	73	139
Dry Hole Cost	141	57
Deferred Income Taxes	57	147
Dividends (Income) from Equity Method Investees, Net	4	23
Unrealized Gain on Commodity Derivative Instruments	(74)	(140)
Gain on Divestitures	(83)	(26)
Other Adjustments for Noncash Items Included in Income	115	52
Changes in Operating Assets and Liabilities
(Increase) Decrease in Accounts Receivable	68	(7)
Increase in Other Current Assets	(51)	(17)
Increase in Accounts Payable	122	131
Increase in Current Income Taxes Payable	51	52
Decrease in Other Current Liabilities	(13)	(25)
Other Operating Assets and Liabilities, Net	(35)	(31)
Net Cash Provided by Operating Activities	2,171	1,785
Cash Flows From Investing Activities
Additions to Property, Plant and Equipment	(2,685)	(1,868)
Marcellus Shale Acquisition	0	(519)
Additions to Equity Method Investments	(35)	(73)
Proceeds from Divestitures	1,161	77
Net Cash Used in Investing Activities	(1,559)	(2,383)
Cash Flows From Financing Activities
Exercise of Stock Options	28	32
Excess Tax Benefits from Stock-Based Awards	14	11
Dividends Paid, Common Stock	(119)	(104)
Purchase of Treasury Stock	(13)	(16)
Proceeds from Credit Facilities	150	520
Repayment of Credit Facilities	(150)	(470)
Repayment of CONSOL Installment Loan	(328)	0
Proceeds from Issuance of Senior Long-Term Debt, Net	0	836
Settlement of Interest Rate Derivative Instrument	0	(40)
Repayment of Capital Lease Obligation	(32)	0
Net Cash Provided By (Used In) Financing Activities	(450)	769
Increase in Cash and Cash Equivalents	162	171
Cash and Cash Equivalents at Beginning of Period	1,455	1,081
Cash and Cash Equivalents at End of Period	$ 1,617	$ 1,252