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ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2017
USD ($)
Nov. 30, 2016
USD ($)
Oct. 31, 2016
USD ($)
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Sep. 30, 2016
USD ($)
Aug. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
May 31, 2016
USD ($)
Apr. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Feb. 29, 2016
USD ($)
Jan. 31, 2016
USD ($)
Nov. 30, 2015
USD ($)
Oct. 31, 2015
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
item
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                                      
Net proceeds from issuance of long-term debt                                   $ 4,203 $ 1,478
Crude oil supply agreements termination costs         $ 160                         160  
Seminole-San Andres EOR                                      
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                                      
Cost of acquired business assets                               $ 600      
Republic of Ecuador | International Center for the Settlement of Investment Disputes                                      
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                                      
Proceeds from settlement                                 $ 330    
Award amount                     $ 1,000                
Pre-tax gain on settlement                                   $ 681  
Pre-tax gain on settlement as of date                                     322
Permian region                                      
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                                      
Number of acres acquired | a     35,000                                
Cost of acquired business assets     $ 2,000                                
Senior notes                                      
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                                      
Debt instrument issued   $ 1,500           $ 2,750           $ 1,500          
Net proceeds from issuance of long-term debt   1,490           2,720           1,480          
3.00% senior notes due 2027                                      
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                                      
Debt instrument issued   $ 750                                  
Debt instrument interest rate stated percentage   3.00%                         3.00%     3.00%  
4.10% senior notes due 2047                                      
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                                      
Debt instrument issued   $ 750                                  
Debt instrument interest rate stated percentage   4.10%                         4.10%     4.10%  
1.75% senior notes due 2017                                      
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                                      
Debt instrument interest rate stated percentage             1.75%                        
Early repayment of debt through exercise of redemption option             $ 1,250                        
4.125% senior notes due 2016                                      
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                                      
Debt instrument interest rate stated percentage           4.125%                     4.125%    
Retired debt           $ 750                          
2.60% senior notes due 2022                                      
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                                      
Debt instrument issued               $ 400                      
Debt instrument interest rate stated percentage               2.60%             2.60%     2.60%  
3.40% senior notes due 2026                                      
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                                      
Debt instrument issued               $ 1,150                      
Debt instrument interest rate stated percentage               3.40%             3.40%     3.40%  
4.40% senior notes due 2046                                      
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                                      
Debt instrument issued               $ 1,200                      
Debt instrument interest rate stated percentage               4.40%             4.40%     4.40%  
2.50% senior notes due 2016                                      
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                                      
Debt instrument interest rate stated percentage                   2.50%                  
Maturities of Senior Debt                   $ 700                  
3.50% senior notes due 2025                                      
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                                      
Debt instrument issued                           $ 750          
Debt instrument interest rate stated percentage                           3.50% 3.50%     3.50%  
4.625% senior notes due 2045                                      
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                                      
Debt instrument issued                           $ 750          
Debt instrument interest rate stated percentage                           4.625% 4.625%     4.625%  
Spin-off California Resources Corp                                      
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                                      
Impairment charges related to a special stock dividend of California Resources shares                 $ 78                    
Non-core Permian acreage | Assets held for sale                                      
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                                      
Sale consideration                             $ 500        
Non-core Permian acreage | Disposed of by sale                                      
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                                      
Sale consideration                             90        
Pre-tax gain on disposal                             $ 55        
Non-strategic acreage in Permian Basin Counties | Disposed of by sale                                      
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                                      
Number of divestitures of non-strategic acreage | item                               2      
Sale consideration                               $ 600      
Pre-tax gain on disposal                               $ 81      
South Texas operations | Disposed of by sale                                      
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                                      
Sale consideration $ 500                                    
Pre-tax gain on disposal $ 500                                    
South Texas Eagle Ford non-operated properties | Disposed of by sale                                      
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                                      
Sale consideration       $ 63                              
Pre-tax gain on disposal       $ 59                              
Williston operations                                      
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                                      
Proceeds from sale of property held-for-sale                       $ 590              
Piceance operations                                      
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                                      
Sale consideration                                     $ 155
Piceance operations | Disposed of by sale                                      
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                                      
Sale consideration                 153                    
Pre-tax gain on disposal                 $ 121                    
Westwood building                                      
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                                      
Proceeds from sale of building                         $ 65            
Occidental Tower building                                      
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                                      
Proceeds from sale of building                     85                
Pre-tax gain on sale of property                     $ 57