CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
NET INCOME	$ 728	$ 1,033
ADJUSTMENTS TO RECONCILE NET INCOME TO CASH PROVIDED BY OPERATING ACTIVITIES:
Depreciation, depletion and amortization	1,447	1,260
Deferred income tax expense	443	659
Unrealized gains on derivatives	(372)	(542)
Stock-based compensation	56	63
Net gains on sales of fixed assets	(158)	(2)
Impairments of fixed assets and other	258	243
Losses on investments	7	120
Gains (losses) on sales of investments	10	(1,030)
Losses on purchases of debt	17	0
Impairment of investment	10	0
Employee retirement and other termination benefits	104	0
Other	(4)	1
Changes in assets and liabilities	(341)	(776)
Cash provided by operating activities	2,205	1,029
CASH FLOWS FROM INVESTING ACTIVITIES:
Drilling and completion costs	(3,159)	(5,120)
Acquisitions of proved and unproved properties	(536)	(1,795)
Proceeds from divestitures of proved and unproved properties	1,895	1,555
Additions to other property and equipment	(506)	(1,311)
Proceeds from sales of other assets	459	79
Additions to investments	(4)	(128)
Proceeds from sales of investments	102	2,000
(Increase) decrease in restricted cash	170	(180)
Other	4	(21)
Cash used in investing activities	(1,575)	(4,921)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from credit facilities borrowings	6,559	10,104
Payments on credit facilities borrowings	(6,578)	(11,592)
Proceeds from issuance of senior notes, net of discount and offering costs	2,274	1,263
Proceeds from issuance of term loans, net of discount and offering costs	0	3,789
Cash paid to purchase debt	(1,874)	0
Cash paid for common stock dividends	(116)	(112)
Cash paid for preferred stock dividends	(86)	(86)
Cash paid on financing derivatives	(25)	(36)
Cash paid for prepayment of mortgage	(55)	0
Proceeds from sales of noncontrolling interests	5	1,039
Proceeds from other financings	22	225
Cash paid to purchase preferred shares of a subsidiary	(212)	0
Distributions to noncontrolling interest owners	(111)	(104)
Other	(43)	82
Cash provided by (used in) financing activities	(240)	4,572
Change in cash and cash equivalents classified as current assets held for sale	0	(7)
Net increase in cash and cash equivalents	390	673
Cash and cash equivalents, beginning of period	287	351
Cash and cash equivalents, end of period	677	1,024
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest, net of capitalized interest	0	0
Income taxes, net of refunds received	13	6
Change in accrued drilling and completion costs	(60)	(55)
Change in accrued acquisition of proved and unproved property costs	54	62
Change in accrued costs for other property and equipment	$ (58)	$ 49