Supplemental Guarantor Information (Details 2) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010	Dec. 31, 2009
CURRENT ASSETS:
Cash and cash equivalents	$ 1,107	$ 134	$ 1,805	$ 2,048
Receivables, net of allowance	2,495	2,134
Inventories	633	564
Drilling advances	250	259
Prepaid assets and other	415	389
Total current assets	4,900	3,480
PROPERTY AND EQUIPMENT, NET	39,838	38,151
OTHER ASSETS:
Intercompany receivable, net	0	0
Equity in affiliates	0	0
Goodwill, net	1,032	1,032
Deferred charges and other	759	762
Total Assets	46,529	43,425	30,432
CURRENT LIABILITIES:
Accounts payable	1,029	779
Accrued exploration and development	1,375	1,367
Current debt	448	46
Current asset retirement obligation	360	407
Derivative instruments	229	194
Other accrued expenses	1,043	731
Total current liabilities	4,484	3,524
LONG-TERM DEBT	7,404	8,095
DEFERRED CREDITS AND OTHER NONCURRENT LIABILITIES:
Income taxes	4,698	4,249
Asset retirement obligation	2,535	2,465
Other	741	715
Total deferred credits other noncurrent liabilities	7,974	7,429
COMMITMENTS AND CONTINGENCIES
SHAREHOLDER'S EQUITY	26,667	24,377	17,676	15,779
Total liabilities and shareholders' equity	46,529	43,425
Apache Corporation [Member]
CURRENT ASSETS:
Cash and cash equivalents	8	6	107	647
Receivables, net of allowance	759	691
Inventories	58	55
Drilling advances	16	10
Prepaid assets and other	3,401	3,313
Total current assets	4,242	4,075
PROPERTY AND EQUIPMENT, NET	11,801	11,314
OTHER ASSETS:
Intercompany receivable, net	4,505	4,695
Equity in affiliates	18,451	16,649
Goodwill, net	0	0
Deferred charges and other	175	178
Total Assets	39,174	36,911
CURRENT LIABILITIES:
Accounts payable	607	480
Accrued exploration and development	312	274
Current debt	400	16
Current asset retirement obligation	317	317
Derivative instruments	154	153
Other accrued expenses	368	400
Total current liabilities	2,158	1,640
LONG-TERM DEBT	6,756	7,447
DEFERRED CREDITS AND OTHER NONCURRENT LIABILITIES:
Income taxes	1,909	1,803
Asset retirement obligation	1,021	1,001
Other	663	643
Total deferred credits other noncurrent liabilities	3,593	3,447
COMMITMENTS AND CONTINGENCIES
SHAREHOLDER'S EQUITY	26,667	24,377
Total liabilities and shareholders' equity	39,174	36,911
Apache Finance Canada [Member]
CURRENT ASSETS:
Cash and cash equivalents	0	0	2	2
Receivables, net of allowance	0	0
Inventories	0	0
Drilling advances	1	2
Prepaid assets and other	0	0
Total current assets	1	2
PROPERTY AND EQUIPMENT, NET	0	0
OTHER ASSETS:
Intercompany receivable, net	0	0
Equity in affiliates	1,309	1,275
Goodwill, net	0	0
Deferred charges and other	1,003	1,003
Total Assets	2,313	2,280
CURRENT LIABILITIES:
Accounts payable	1	2
Accrued exploration and development	0	0
Current debt	0	0
Current asset retirement obligation	0	0
Derivative instruments	0	0
Other accrued expenses	4	3
Total current liabilities	5	5
LONG-TERM DEBT	647	647
DEFERRED CREDITS AND OTHER NONCURRENT LIABILITIES:
Income taxes	5	5
Asset retirement obligation	0	0
Other	250	250
Total deferred credits other noncurrent liabilities	255	255
COMMITMENTS AND CONTINGENCIES
SHAREHOLDER'S EQUITY	1,406	1,373
Total liabilities and shareholders' equity	2,313	2,280
All Other Subsidiaries of Apache Corporation [Member]
CURRENT ASSETS:
Cash and cash equivalents	1,099	128	1,696	1,399
Receivables, net of allowance	1,736	1,443
Inventories	575	509
Drilling advances	233	247
Prepaid assets and other	(2,986)	(2,924)
Total current assets	657	(597)
PROPERTY AND EQUIPMENT, NET	28,037	26,837
OTHER ASSETS:
Intercompany receivable, net	(2,973)	(3,149)
Equity in affiliates	97	98
Goodwill, net	1,032	1,032
Deferred charges and other	581	581
Total Assets	27,431	24,802
CURRENT LIABILITIES:
Accounts payable	1,953	1,843
Accrued exploration and development	1,063	1,093
Current debt	48	30
Current asset retirement obligation	43	90
Derivative instruments	75	41
Other accrued expenses	671	328
Total current liabilities	3,853	3,425
LONG-TERM DEBT	1	1
DEFERRED CREDITS AND OTHER NONCURRENT LIABILITIES:
Income taxes	2,784	2,441
Asset retirement obligation	1,514	1,464
Other	828	822
Total deferred credits other noncurrent liabilities	5,126	4,727
COMMITMENTS AND CONTINGENCIES
SHAREHOLDER'S EQUITY	18,451	16,649
Total liabilities and shareholders' equity	27,431	24,802
Reclassifications and Eliminations [Member]
CURRENT ASSETS:
Cash and cash equivalents	0	0	0	0
Receivables, net of allowance	0	0
Inventories	0	0
Drilling advances	0	0
Prepaid assets and other	0	0
Total current assets	0	0
PROPERTY AND EQUIPMENT, NET	0	0
OTHER ASSETS:
Intercompany receivable, net	(1,532)	(1,546)
Equity in affiliates	(19,857)	(18,022)
Goodwill, net	0	0
Deferred charges and other	(1,000)	(1,000)
Total Assets	(22,389)	(20,568)
CURRENT LIABILITIES:
Accounts payable	(1,532)	(1,546)
Accrued exploration and development	0	0
Current debt	0	0
Current asset retirement obligation	0	0
Derivative instruments	0	0
Other accrued expenses	0	0
Total current liabilities	(1,532)	(1,546)
LONG-TERM DEBT	0	0
DEFERRED CREDITS AND OTHER NONCURRENT LIABILITIES:
Income taxes	0	0
Asset retirement obligation	0	0
Other	(1,000)	(1,000)
Total deferred credits other noncurrent liabilities	(1,000)	(1,000)
COMMITMENTS AND CONTINGENCIES
SHAREHOLDER'S EQUITY	(19,857)	(18,022)
Total liabilities and shareholders' equity	$ (22,389)	$ (20,568)