Supplemental Guarantor Information (Details 1) (USD $) In Millions	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	$ 4,724	$ 3,085
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to oil and gas property	(3,170)	(1,937)
Additions to gas gathering, transmission and processing facilities	(269)	(257)
Acquisition of Devon properties		(1,017)
Acquisitions, other	(78)	(16)
Proceeds from sale of oil and gas properties	192
Other, net	(52)	(7)
NET CASH USED IN INVESTING ACTIVITIES	(3,377)	(3,218)
CASH FLOWS FROM FINANCING ACTIVITIES:
Commercial paper, credit facility and bank notes, net	(289)	(55)
Dividends paid	(153)	(101)
Common stock activity	38	21
Treasury stock activity, net	4	3
Other	26	22
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	(374)	(110)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	973	(243)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	134	2,048
CASH AND CASH EQUIVALENTS AT END OF PERIOD	1,107	1,805
Apache Corporation [Member]
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	1,078	1,184
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to oil and gas property	(864)	(529)
Acquisition of Devon properties		(1,017)
Proceeds from sale of oil and gas properties	6
Investment in subsidiaries, net	198	(80)
Other, net	(34)	(45)
NET CASH USED IN INVESTING ACTIVITIES	(694)	(1,671)
CASH FLOWS FROM FINANCING ACTIVITIES:
Commercial paper, credit facility and bank notes, net	(309)	2
Dividends paid	(153)	(101)
Common stock activity	38	21
Treasury stock activity, net	4	3
Other	38	22
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	(382)	(53)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	2	(540)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	6	647
CASH AND CASH EQUIVALENTS AT END OF PERIOD	8	107
Apache Finance Canada [Member]
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	(29)	(36)
CASH FLOWS FROM FINANCING ACTIVITIES:
Commercial paper, credit facility and bank notes, net		3
Intercompany borrowings	(1)
Common stock activity	30	33
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	29	36
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS		0
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	0	2
CASH AND CASH EQUIVALENTS AT END OF PERIOD	0	2
All Other Subsidiaries of Apache Corporation [Member]
CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS
CASH PROVIDED BY (USED IN) OPERATING ACTIVITIES	3,675	1,937
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to oil and gas property	(2,306)	(1,408)
Additions to gas gathering, transmission and processing facilities	(269)	(257)
Acquisitions, other	(78)
Proceeds from sale of oil and gas properties	186
Other, net	(18)	38
NET CASH USED IN INVESTING ACTIVITIES	(2,485)	(1,627)
CASH FLOWS FROM FINANCING ACTIVITIES:
Commercial paper, credit facility and bank notes, net	20	18
Intercompany borrowings	(189)
Common stock activity	(38)	(31)
Other	(12)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	(219)	(13)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	971	297
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	128	1,399
CASH AND CASH EQUIVALENTS AT END OF PERIOD	1,099	1,696
Reclassifications and Eliminations [Member]
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in subsidiaries, net	(198)	80
NET CASH USED IN INVESTING ACTIVITIES	(198)	80
CASH FLOWS FROM FINANCING ACTIVITIES:
Commercial paper, credit facility and bank notes, net		(78)
Intercompany borrowings	190
Common stock activity	8	(2)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	198	(80)
CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR	0	0
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 0	$ 0

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Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation).

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-Name Accounting Standards Codification
-Glossary Financing Activities
-URI http://asc.fasb.org/extlink&oid=6513228

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