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Debt and Interest Expense - Subsequent Events (Detail) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
Jan. 15, 2015
Jan. 30, 2015
364-Day Facility [Member] | Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Line of credit, maximum capacity $ 2,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= apc_RevolvingCreditFacility4Member
   
Debt instrument, term 364 days    
Subsequent Event [Member] | Commercial Paper [Member]      
Debt Instrument [Line Items]      
Line of credit, maximum capacity   3,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_CommercialPaperMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Subsequent Event [Member] | Commercial Paper [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Debt instrument, term   397 days  
Subsequent Event [Member] | 364-Day Facility [Member] | Revolving Credit Facility [Member]      
Debt Instrument [Line Items]      
Line of credit, outstanding borrowings     $ 1,500,000,000us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= apc_RevolvingCreditFacility4Member
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember