CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES:
NET INCOME (LOSS)	$ (938)	$ 1,269
ADJUSTMENTS TO RECONCILE NET INCOME (LOSS) TO CASH PROVIDED BY OPERATING ACTIVITIES:
Depreciation, depletion and amortization	2,089	1,353
Deferred income tax expense (benefit)	(623)	801
Unrealized (gains) losses on derivatives	(440)	456
Stock-based compensation	93	119
Losses on sales and impairments of fixed assets	262	7
Impairment of natural gas and oil properties	3,315	0
(Gains) losses on investments	147	(19)
Gains on sales of investments	(1,061)	0
Other	80	12
Changes in assets and liabilities	(946)	(274)
Cash provided by operating activities	1,978	3,724
CASH FLOWS FROM INVESTING ACTIVITIES:
Drilling and completion costs	(7,525)	(5,345)
Acquisitions of proved and unproved properties	(2,813)	(3,773)
Proceeds from divestitures of proved and unproved properties	2,445	6,357
Additions to other property and equipment	(1,916)	(1,416)
Proceeds from sales of other assets	219	682
Proceeds from (additions to) investments	(261)	126
Proceeds from sale of midstream investment	2,000	0
Acquisition of drilling company	0	(339)
Increase in restricted cash	(280)	0
Other	(23)	(7)
Cash used in investing activities	(8,154)	(3,715)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from credit facilities borrowings	13,986	11,914
Payments on credit facilities borrowings	(13,614)	(12,057)
Proceeds from issuance of term loans, net of discount and offering costs	3,789	0
Proceeds from issuance of senior notes, net of discount and offering costs	1,263	977
Cash paid to purchase debt	0	(2,015)
Cash paid for common stock dividends	(170)	(151)
Cash paid for preferred stock dividends	(128)	(128)
Cash (paid) received on financing derivatives	(36)	1,085
Proceeds from sales of noncontrolling interests	1,056	0
Proceeds from other financings	225	0
Distributions to noncontrolling interest owners	(163)	0
Net increase (decrease) in outstanding payments in excess of cash balance	(159)	489
Other	(68)	(114)
Cash provided by financing activities	5,981	0
Change in cash and cash equivalents classified as current assets held for sale	(14)	0
Net increase (decrease) in cash and cash equivalents	(209)	9
Cash and cash equivalents, beginning of period	351	102
Cash and cash equivalents, end of period	142	111
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION OF NET CASH PAYMENTS (REFUNDS) FOR:
Interest, net of capitalized interest	0	18
Income taxes, net of refunds received	$ 31	$ (25)