Consolidated Statements of Cash Flows (unaudited) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash Flows From Operating Activities
Net Income	$ 639	$ 556
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Depreciation, Depletion and Amortization	736	651
Asset Impairments	0	73	[1]
Dry Hole Cost	23	118
Deferred Income Taxes	108	92
Dividends (Income) from Equity Method Investees, Net	(18)	(7)
Unrealized Gain on Commodity Derivative Instruments	(80)	(204)
Gain on Divestitures	(67)	(9)
Stock Based Compensation	38	33
Other Adjustments for Noncash Items Included in Income	33	8
Changes in Operating Assets and Liabilities
Increase in Accounts Receivable	(193)	(58)
Decrease (Increase) in Other Current Assets	4	(49)
Increase in Accounts Payable	131	84
Decrease in Current Income Taxes Payable	(81)	(13)
Increase (Decrease) in Other Current Liabilities	(37)	14
Decrease (Increase) in Other Operating Assets and Liabilities, Net	8	(42)
Net Cash Provided by Operating Activities	1,244	1,247
Cash Flows From Investing Activities
Additions to Property, Plant and Equipment	(1,929)	(1,900)
Additions to Equity Method Investments	(23)	(35)
Proceeds from Divestitures	114	10
Other	3	0
Net Cash Used in Investing Activities	(1,835)	(1,925)
Cash Flows From Financing Activities
Exercise of Stock Options	31	26
Excess Tax Benefits from Stock-Based Awards	12	13
Dividends Paid, Common Stock	(96)	(79)
Purchase of Treasury Stock	(14)	(13)
Repayment of Capital Lease Obligation	(23)	(22)
Net Cash Used In Financing Activities	(90)	(75)
Decrease in Cash and Cash Equivalents	(681)	(753)
Cash and Cash Equivalents at Beginning of Period	1,387	1,455
Cash and Cash Equivalents at End of Period	$ 706	$ 702

[1] Amounts for 2012 related primarily to our South Raton development in the deepwater Gulf of Mexico and our Piceance development, onshore US. The assets were written down to their estimated fair values, which were determined using discounted cash flow models.