v2.4.0.8
Debt (Details Textual) (USD $)
6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Commercial Paper Programs (Textual) [Abstract]    
Total amount under revolving credit facilities $ 7,500,000,000  
Maturity period of commercial paper (in days) P90D  
Letters of credit issued 786,000,000  
Commercial paper outstanding 1,009,000,000 1,055,000,000
Credit facilities remaining after commercial paper outstanding and issuance of letters of credit 6,500,000,000  
Debt (Textual) [Abstract]    
Classification of short-term debt as long-term debt 915,000,000  
Capital Leases    
Capital lease, initial non-cancelable term 15 years  
Capital lease, cancelable term 5 years  
Capital lease, additional term 5 years  
Capital lease obligation 906,000,000  
Incremental Borrowing Rate 3.58%  
Future minimum lease payments, remainder of year 46,000,000  
Future minimum lease payments, per year, years one through five 78,000,000  
Future minimum lease payments, due after five years 814,000,000  
7.625% Debentures Due 2013 [Member]
   
Changes in Debt Balance [Abstract]    
Stated percentage of debt 7.625%  
Debt instruments repaid 100,000,000  
5.50% Notes Due 2013 [Member]
   
Changes in Debt Balance [Abstract]    
Stated percentage of debt 5.50%  
Debt instruments repaid 750,000,000  
Revolving Credit Facilities [Member]
   
Commercial Paper Programs (Textual) [Abstract]    
Direct outstanding borrowings under the revolving credit facilities 0 0
Letters of credit issued 0 0
ConocoPhillips [Member]
   
Commercial Paper Programs (Textual) [Abstract]    
ConocoPhillips Commercial Paper Program 6,350,000,000  
ConocoPhillips Qatar Funding Ltd. [Member]
   
Commercial Paper Programs (Textual) [Abstract]    
ConocoPhillips Commercial Paper Program $ 1,150,000,000