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Debt (Details Textual) (USD $)
1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
May 31, 2013
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Unsecured Committed Bank Credit Facilities [Member]
Dec. 31, 2016
Unsecured Committed Bank Credit Facilities [Member]
May 31, 2013
Unsecured Committed Bank Credit Facilities [Member]
Dec. 31, 2011
Unsecured Committed Bank Credit Facilities in U.S. [Member]
Dec. 31, 2011
Unsecured Committed Bank Credit Facilities in Australia [Member]
Dec. 31, 2011
Unsecured Committed Bank Credit Facilities in Canada [Member]
Dec. 31, 2011
United States Overdraft Lines of Credit [Member]
Dec. 31, 2010
United States Overdraft Lines of Credit [Member]
Dec. 31, 2011
Argentina overdraft lines of credit [Member]
Dec. 31, 2010
Argentina overdraft lines of credit [Member]
Dec. 31, 2011
Five Year Facility [Member]
Dec. 31, 2011
Commercial Paper Program Maximum Amount [Member]
Dec. 31, 2011
Notes Payable, Other Payables [Member]
Dec. 31, 2011
7.625% debentures due 2096 [Member]
Dec. 31, 2010
7.625% debentures due 2096 [Member]
Dec. 31, 2011
7.375% debentures due 2047 [Member]
Dec. 31, 2010
7.375% debentures due 2047 [Member]
Dec. 31, 2011
5.25% notes due 2042 [Member]
Dec. 31, 2010
5.25% notes due 2042 [Member]
Dec. 31, 2011
5.1% notes due 2040 [Member]
Dec. 31, 2010
5.1% notes due 2040 [Member]
Dec. 31, 2011
6.0% notes due 2037 [Member]
Dec. 31, 2010
6.0% notes due 2037 [Member]
Dec. 31, 2011
7.95% notes due 2026 [Member]
Dec. 31, 2010
7.95% notes due 2026 [Member]
Dec. 31, 2011
7.7% notes due 2026 [Member]
Dec. 31, 2010
7.7% notes due 2026 [Member]
Dec. 31, 2011
3.625% notes due 2021 [Member]
Dec. 31, 2010
3.625% notes due 2021 [Member]
Dec. 31, 2011
8 % senior notes due 2017
Dec. 31, 2011
7.625% notes due 2019 [Member]
Dec. 31, 2010
7.625% notes due 2019 [Member]
Dec. 31, 2011
7.0% notes due 2018 [Member]
Dec. 31, 2010
7.0% notes due 2018 [Member]
Dec. 31, 2011
6.9% notes due 2018 [Member]
Dec. 31, 2010
6.9% notes due 2018 [Member]
Dec. 31, 2011
5.625% notes due 2017 [member]
Dec. 31, 2010
5.625% notes due 2017 [member]
Dec. 31, 2011
6.0% notes due 2013 [Member]
Dec. 31, 2010
6.0% notes due 2013 [Member]
Dec. 31, 2011
5.25% notes due 2013 [Member]
Dec. 31, 2010
5.25% notes due 2013 [Member]
Dec. 31, 2011
6.25% notes due 2012 [Member}
Dec. 31, 2010
6.25% notes due 2012 [Member}
Dec. 31, 2011
Apache Finance Canada 7.75% notes due 2029 [Member]
Dec. 31, 2010
Apache Finance Canada 7.75% notes due 2029 [Member]
Dec. 31, 2011
Apache Finance Canada 4.375% notes due 2015 [Member]
Dec. 31, 2010
Apache Finance Canada 4.375% notes due 2015 [Member]
Debt Instrument [Line Items]                                                                                                        
Principal amount of senior unsecured notes   $ 7,262,000,000 $ 8,190,000,000                             $ 150,000,000 $ 150,000,000 $ 150,000,000 $ 150,000,000 $ 500,000,000 $ 500,000,000 $ 1,500,000,000 $ 1,500,000,000 $ 1,000,000,000 $ 1,000,000,000 $ 180,000,000 $ 180,000,000 $ 100,000,000 $ 100,000,000 $ 500,000,000 $ 500,000,000   $ 150,000,000 $ 150,000,000 $ 150,000,000 $ 150,000,000 $ 400,000,000 $ 400,000,000 $ 500,000,000 $ 500,000,000 $ 400,000,000 $ 400,000,000 $ 500,000,000 $ 500,000,000 $ 400,000,000 $ 400,000,000 $ 300,000,000 $ 300,000,000 $ 350,000,000 $ 350,000,000
Interest on senior notes                                                   6.00%   7.95%   7.70%       8.00%     7.00%                       7.75%   4.375%  
Short-term Debt [Line Items]                                                                                                        
Commercial paper program                               2,950,000,000                                                                        
Period For Borrowing Funds   5 years                             270 days                                                                      
Line of Credit Facility [Line Items]                                                                                                        
Outstanding balance under the facility secured revolving syndicated                     31,000,000 46,000,000 31,000,000 46,000,000                                                                            
Unsecured credit facility available to Company         3,300,000,000 1,000,000,000 2,300,000,000                                                                                          
Revolving bank facility         1,500,000,000     450,000,000 200,000,000 150,000,000                                                                                    
Line of Credit Facility, Remaining Borrowing Capacity   3,300,000,000                                                                                                    
Line of credit facility, expiration date   P5Y                                                                                                    
New unsecured committed revolving banking facility                             1,000,000,000                                                                          
Direct payment obligation         100,000,000                                                                                              
Margin over LIBOR for committed loans         0.19%     0.23% 0.23% 0.23%                                                                                    
Additional margin over LIBOR offered rate if loans borrowed equals or exceeds 50 percent of total facility commitments         0.05%     0.10% 0.10% 0.10%                                                                                    
Quarterly facility fees         0.06 percent on total amount     0.07 percent on total amount 0.07 percent on total amount 0.07 percent on total amount                                                                                    
Commitment fee percentage   0.125%     0.06%     0.07% 0.07% 0.07%                                                                                    
Debt And Financing Costs (Textual) [Abstract]                                                                                                        
Maturing date of credit facilities May 13, 2013 Aug. 16, 2016                                                                                                    
Carrying Amount, Commercial paper   0 913,000,000                                                                                                  
Percentage of letter of credit facility commitment   50.00%                                                                                                    
Percentage of liens of companies consolidated asset   5.00%                                                                                                    
Debt to Capitalization ratio   0.20                                                                                                    
Maximum debt to capitalization ratio allowed by covenants   (0.60)                                                                                                    
Maximum potential lien on assets located in specified regions   2,600,000,000                                                                                                    
Line of Credit Facility, Interest Rate Description   At December 31, 2011, the margin over LIBOR for committed loans was 0.19 percent on the $1.5 billion facility and 0.23 percent on the $450 million facility in the U.S., the $200 million facility in Australia and the $150 million facility in Canada. If the total amount of the loans borrowed under the $1.5 billion facility equals or exceeds 50 percent of the total facility commitments, then an additional 0.05 percent will be added to the margins over LIBOR. If the total amount of the loans borrowed under all of the other three facilities equals or exceeds 50 percent of the total facility commitments, then an additional 0.10 percent will be added to the margins over LIBOR. The Company also pays quarterly facility fees of 0.06 percent on the total amount of the $1.5 billion facility and 0.07 percent on the total amount of the other three facilities. The facility fees vary based upon the Company’s senior long-term debt rating.                                                                                                    
Weighted average interest rate for commercial paper   0.37%                                                                                                    
Unamortized deferred loan costs associated with its various debt obligations   48,000,000 53,000,000                                                                                                  
Amortization of Debt Discount (Premium)   2,000,000 2,000,000 1,000,000                                                                                                
Debt discounts   $ 46,000,000 $ 49,000,000                                                                                                  
Margin for committed loans   0.875%                                                                                                    
Available backstops   100.00%