Supplemental Guarantor Information (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
REVENUES AND OTHER:
Oil and gas production revenues	$ 4,282	$ 3,047	$ 12,515	$ 8,709
Other	46	(34)	76	(51)
Total revenues and other	4,328	3,013	12,591	8,658
OPERATING EXPENSES:
Depreciation, depletion and amortization	1,065	787	3,030	2,155
Asset retirement obligation accretion	39	25	114	74
Lease operating expenses	661	507	1,946	1,393
Gathering and transportation	72	43	221	126
Taxes other than income	244	158	663	522
General and administrative	112	89	327	260
Merger, acquisitions & transition	4	8	15	16
Financing costs, net	37	59	123	174
Total operating expenses	2,234	1,676	6,439	4,720
INCOME BEFORE INCOME TAXES	2,094	1,337	6,152	3,938
Provision (benefit) for income taxes	1,092	559	2,757	1,595
NET INCOME	1,002	778	3,395	2,343
Preferred stock dividends	19	13	57	13
INCOME ATTRIBUTABLE TO COMMON STOCK	983	765	3,338	2,330
Apache Corporation [Member]
REVENUES AND OTHER:
Oil and gas production revenues	1,097	960	3,230	2,711
Equity in net income (loss) of affiliates	821	540	2,687	1,735
Other	18	19	23	22
Total revenues and other	1,936	1,519	5,940	4,468
OPERATING EXPENSES:
Depreciation, depletion and amortization	323	283	938	731
Asset retirement obligation accretion	18	13	52	38
Lease operating expenses	199	220	603	558
Gathering and transportation	13	10	37	31
Taxes other than income	49	39	140	107
General and administrative	86	72	262	208
Merger, acquisitions & transition	3	8	10	16
Financing costs, net	33	31	104	133
Total operating expenses	724	676	2,146	1,822
INCOME BEFORE INCOME TAXES	1,212	843	3,794	2,646
Provision (benefit) for income taxes	210	65	399	303
NET INCOME	1,002	778	3,395	2,343
Preferred stock dividends	19	13	57	13
INCOME ATTRIBUTABLE TO COMMON STOCK	983	765	3,338	2,330
Apache Finance Canada [Member]
REVENUES AND OTHER:
Equity in net income (loss) of affiliates	188	(13)	163	50
Other	148	(1)	109	28
Total revenues and other	336	(14)	272	78
OPERATING EXPENSES:
Financing costs, net	14	14	42	42
Total operating expenses	14	14	42	42
INCOME BEFORE INCOME TAXES	322	(28)	230	36
Provision (benefit) for income taxes	69	(6)	50	10
NET INCOME	253	(22)	180	26
INCOME ATTRIBUTABLE TO COMMON STOCK	253	(22)	180	26
All Other Subsidiaries of Apache Corporation [Member]
REVENUES AND OTHER:
Oil and gas production revenues	3,185	2,087	9,285	5,998
Equity in net income (loss) of affiliates	65	(9)	17	(24)
Other	(119)	(51)	(53)	(98)
Total revenues and other	3,131	2,027	9,249	5,876
OPERATING EXPENSES:
Depreciation, depletion and amortization	742	504	2,092	1,424
Asset retirement obligation accretion	21	12	62	36
Lease operating expenses	462	287	1,343	835
Gathering and transportation	59	33	184	95
Taxes other than income	195	119	523	415
General and administrative	27	18	68	55
Merger, acquisitions & transition	1		5
Financing costs, net	(10)	14	(23)	(1)
Total operating expenses	1,497	987	4,254	2,859
INCOME BEFORE INCOME TAXES	1,634	1,040	4,995	3,017
Provision (benefit) for income taxes	813	500	2,308	1,282
NET INCOME	821	540	2,687	1,735
INCOME ATTRIBUTABLE TO COMMON STOCK	821	540	2,687	1,735
Reclassifications and Eliminations [Member]
REVENUES AND OTHER:
Equity in net income (loss) of affiliates	(1,074)	(518)	(2,867)	(1,761)
Other	(1)	(1)	(3)	(3)
Total revenues and other	(1,075)	(519)	(2,870)	(1,764)
OPERATING EXPENSES:
General and administrative	(1)	(1)	(3)	(3)
Total operating expenses	(1)	(1)	(3)	(3)
INCOME BEFORE INCOME TAXES	(1,074)	(518)	(2,867)	(1,761)
NET INCOME	(1,074)	(518)	(2,867)	(1,761)
INCOME ATTRIBUTABLE TO COMMON STOCK	$ (1,074)	$ (518)	$ (2,867)	$ (1,761)