Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Cash Flows From Operating Activities
Net Income (Loss)	$ 453	[1]	$ 725	[2]	$ (131)
Adjustments to Reconcile Net Income (Loss) to Net Cash Provided by Operating Activities
Depreciation, Depletion and Amortization	965		883		816
Dry Hole Expense	105		58		11
Gain on Divestitures	(25)		(113)		(22)
Asset Impairments	759		144		604
Deferred Income Taxes	(81)		71		(296)
Dividends (Income) from Equity Method Investees, Net	30		21		8
Unrealized (Gain) Loss on Commodity Derivative Instruments	22		(70)		606
Stock Based Compensation	58		54		49
Other Adjustments for Noncash Items Included in Income	40		15		10
Changes in Operating Assets and Liabilities
(Increase) Decrease in Accounts Receivable	(244)		(86)		(28)
(Increase) Decrease in Other Current Assets	7		18		(4)
Increase (Decrease) in Accounts Payable	(2)		234		(19)
Increase (Decrease) in Other Current Liabilities	75		34		(38)
Other Operating Assets and Liabilities, Net	8		(42)		(58)
Net Cash Provided by Operating Activities	2,170		1,946		1,508
Cash Flows From Investing Activities
Additions to Property, Plant and Equipment	(2,594)		(1,885)		(1,268)
Marcellus Shale Asset Acquisition	(527)		0		0
DJ Basin Asset Acquisition	0		(458)		0
Additions to Equity Method Investments	(69)		0		0
Proceeds from Divestitures	77		564		3
Net Cash Used in Investing Activities	(3,113)		(1,779)		(1,265)
Cash Flows From Financing Activities
Exercise of Stock Options	38		47		17
Excess Tax Benefits from Stock-Based Awards	15		25		5
Dividends Paid, Common Stock	(143)		(127)		(126)
Purchase of Treasury Stock	(17)		(13)		(1)
Proceeds from Credit Facilities	520		760		340
Repayment of Credit Facilities	(870)		(792)		(1,564)
Proceeds from Issuance of Senior Long-Term Debt	1,828		0		989
Settlement of Interest Rate Derivative Instrument	(40)		0		0
Other	(14)		0		(29)
Net Cash Provided by (Used in) Financing Activities	1,317		(100)		(369)
Increase (Decrease) in Cash and Cash Equivalents	374		67		(126)
Cash and Cash Equivalents at Beginning of Period	1,081		1,014		1,140
Cash and Cash Equivalents at End of Period	$ 1,455		$ 1,081		$ 1,014

[1] First quarter 2011 included the following: $8 million asset impairment charges (See Note 4. Asset Impairments); and $286 million loss on commodity derivative instruments, including unrealized mark-to-market loss of $303 million (See Note 10. Derivative Instruments and Hedging Activities). Second quarter 2011 included the following: $143 million gain on commodity derivative instruments, including unrealized mark-to-market gain of $142 million (See Note 10. Derivative Instruments and Hedging Activities); $25 million pre-tax gain on divestitures due to the completed transfer of assets and exit from Ecuador (See Note 3. Acquisitions and Divestitures); and $131 million asset impairment charges (See Note 4. Asset Impairments). Third quarter 2011 included the following: $322 million gain on commodity derivative instruments, including unrealized mark-to-market gain of $300 million (See Note 10. Derivative Instruments and Hedging Activities). Fourth quarter 2011 included the following: $620 million asset impairment charges (See Note 4. Asset Impairments); and $137 million loss on commodity derivative instruments, including unrealized mark-to-market loss of $162 million (See Note 10. Derivative Instruments and Hedging Activities).

[2] First quarter 2010 included the following: $145 million gain on commodity derivative instruments, including unrealized mark-to-market gain of $147 million (See Note 10. Derivative Instruments and Hedging Activities). Second quarter 2010 included the following: $96 million gain on commodity derivative instruments, including unrealized mark-to-market gain of $63 million (See Note 10. Derivative Instruments and Hedging Activities); and $26 million rig contract termination expense due to the Deepwater Moratorium. Third quarter 2010 included the following: $38 million gain on commodity derivative instruments, including unrealized mark-to-market gain of $5 million (See Note 10. Derivative Instruments and Hedging Activities); $114 million gain on sale of non-core onshore US assets (See Note 3. Acquisitions and Divestitures); and $100 million asset impairment charges (See Note 4. Asset Impairments). Fourth quarter 2010 included the following: $122 million loss on commodity derivative instruments, including unrealized mark-to-market loss of $145 million (See Note 10. Derivative Instruments and Hedging Activities); and $44 million asset impairment charges (See Note 4. Asset Impairments).