Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash Flows From Operating Activities
Net Income (Loss)	$ (413)	$ 811
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Depreciation, Depletion and Amortization	1,444	1,297
Asset Impairments	43	164
Dry Hole Cost	154	163
Deferred Income Tax (Benefit) Expense	(244)	61
Income (Loss) from Equity Method Investees, Net of Dividends	(4)	53
(Gain) Loss on Commodity Derivative Instruments	(331)	(74)
Net Cash Received (Paid) in Settlement of Commodity Derivative Instruments	683	(95)
Gain on Divestitures	0	(72)
Stock Based Compensation	69	67
Non-cash Pension Termination Expense	81	0
Other Adjustments for Noncash Items Included in Income	78	42
Changes in Operating Assets and Liabilities
Decrease in Accounts Receivable	370	166
(Decrease) Increase in Accounts Payable	(248)	103
(Decrease) in Current Income Taxes Payable	(118)	21
Other Current Assets and Liabilities, Net	(28)	16
Other Operating Assets and Liabilities, Net	(50)	(20)
Net Cash Provided by Operating Activities	1,486	2,703
Cash Flows From Investing Activities
Additions to Property, Plant and Equipment	(2,519)	(3,585)
Rosetta Merger	61	0
Additions to Equity Method Investments	(86)	(58)
Distribution from Equity Method Investee	0	156
Proceeds from Divestitures	151	312
Net Cash Used in Investing Activities	(2,393)	(3,175)
Cash Flows From Financing Activities
Exercise of Stock Options	7	45
Excess Tax Benefits from Stock-Based Awards	2	18
Dividends Paid, Common Stock	(214)	(182)
Purchase of Treasury Stock	(20)	(15)
Proceeds from Issuance of Shares of Common Stock to Public, Net of Offering Costs	1,112	0
Proceeds from Credit Facility	0	900
Repayment of Credit Facility	(74)	0
Repayment of Senior Notes	(12)	(200)
Repayment of Capital Lease Obligation	(49)	(42)
Net Cash Provided by Financing Activities	752	524
Increase (Decrease) in Cash and Cash Equivalents	(155)	52
Cash and Cash Equivalents at Beginning of Period	1,183	1,117
Cash and Cash Equivalents at End of Period	$ 1,028	$ 1,169