Supplemental Guarantor Information (Details) (USD $) In Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Mar. 31, 2010	Jun. 30, 2011	Jun. 30, 2010
REVENUES AND OTHER:
Oil and gas production revenues	$ 4,355	$ 2,969		$ 8,233	$ 5,662
Other	(17)	3		30	(17)
Total revenues and other	4,338	2,972		8,263	5,645
OPERATING EXPENSES:
Depreciation, depletion and amortization	1,029	729		1,965	1,368
Asset retirement obligation accretion	38	25		75	49
Lease operating expenses	662	446		1,285	886
Gathering and transportation	73	43		149	83
Taxes other than income	255	187		419	364
General and administrative	103	84		215	171
Merger, acquisitions & transition	6	8		11	8
Financing costs, net	41	56		86	115
Total operating expenses	2,207	1,578		4,205	3,044
INCOME BEFORE INCOME TAXES	2,131	1,394		4,058	2,601
Provision (benefit) for income taxes	872	534		1,665	1,036
NET INCOME	1,259	860	1,565	2,393	1,565
Preferred stock dividends	19			38
INCOME ATTRIBUTABLE TO COMMON STOCK	1,240	860		2,355	1,565
Apache Corporation [Member]
REVENUES AND OTHER:
Oil and gas production revenues	1,127	861		2,133	1,750
Equity in net income (loss) of affiliates	972	731		1,866	1,195
Other	4	2		5	3
Total revenues and other	2,103	1,594		4,004	2,948
OPERATING EXPENSES:
Depreciation, depletion and amortization	315	234		615	448
Asset retirement obligation accretion	17	13		34	25
Lease operating expenses	213	172		404	337
Gathering and transportation	12	10		24	21
Taxes other than income	50	32		91	68
General and administrative	84	64		173	136
Merger, acquisitions & transition	5	8		10	8
Financing costs, net	34	50		71	102
Total operating expenses	730	583		1,422	1,145
INCOME BEFORE INCOME TAXES	1,373	1,011		2,582	1,803
Provision (benefit) for income taxes	114	151		189	238
NET INCOME	1,259			2,393
Preferred stock dividends	19			38
INCOME ATTRIBUTABLE TO COMMON STOCK	1,240	860		2,355	1,565
Apache Finance Canada [Member]
REVENUES AND OTHER:
Equity in net income (loss) of affiliates	(11)	39		(25)	64
Other	(19)	15		(39)	29
Total revenues and other	(30)	54		(64)	93
OPERATING EXPENSES:
Financing costs, net	14	14		28	28
Total operating expenses	14	14		28	28
INCOME BEFORE INCOME TAXES	(44)	40		(92)	65
Provision (benefit) for income taxes	(13)	10		(19)	16
NET INCOME	(31)			(73)
INCOME ATTRIBUTABLE TO COMMON STOCK	(31)	30		(73)	49
All Other Subsidiaries of Apache Corporation [Member]
REVENUES AND OTHER:
Oil and gas production revenues	3,228	2,108		6,100	3,912
Equity in net income (loss) of affiliates	(20)	(9)		(48)	(15)
Other	(1)	(13)		66	(47)
Total revenues and other	3,207	2,086		6,118	3,850
OPERATING EXPENSES:
Depreciation, depletion and amortization	714	495		1,350	920
Asset retirement obligation accretion	21	12		41	24
Lease operating expenses	449	274		881	549
Gathering and transportation	61	33		125	62
Taxes other than income	205	155		328	296
General and administrative	20	21		44	37
Merger, acquisitions & transition	1			1
Financing costs, net	(7)	(8)		(13)	(15)
Total operating expenses	1,464	982		2,757	1,873
INCOME BEFORE INCOME TAXES	1,743	1,104		3,361	1,977
Provision (benefit) for income taxes	771	373		1,495	782
NET INCOME	972			1,866
INCOME ATTRIBUTABLE TO COMMON STOCK	972	731		1,866	1,195
Reclassifications and Eliminations [Member]
REVENUES AND OTHER:
Equity in net income (loss) of affiliates	(941)	(761)		(1,793)	(1,244)
Other	(1)	(1)		(2)	(2)
Total revenues and other	(942)	(762)		(1,795)	(1,246)
OPERATING EXPENSES:
General and administrative	(1)	(1)		(2)	(2)
Total operating expenses	(1)	(1)		(2)	(2)
INCOME BEFORE INCOME TAXES	(941)	(761)		(1,793)	(1,244)
NET INCOME	(941)			(1,793)
INCOME ATTRIBUTABLE TO COMMON STOCK	$ (941)	$ (761)		$ (1,793)	$ (1,244)