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ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS (Details)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Nov. 30, 2016
USD ($)
Oct. 31, 2016
USD ($)
a
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 ($)
Dec. 31, 2014
USD ($)
a
Nov. 30, 2014
USD ($)
Apr. 30, 2014
USD ($)
Feb. 28, 2014
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Acquisitions, dispositions and other transactions                                          
Net proceeds from issuance of long-term debt                                       $ 4,203.0 $ 1,478.0
Crude oil supply agreements termination costs       $ 160.0                               160.0  
Libya                                          
Acquisitions, dispositions and other transactions                                          
Impairments of assets                                       $ 61.0  
Republic of Ecuador | International Center for the Settlement of Investment Disputes                                          
Acquisitions, dispositions and other transactions                                          
Proceeds from settlement                                   $ 330.0      
Award amount                   $ 1,000.0                      
Pre-tax gain on settlement                                     $ 681.0    
Pre-tax gain on settlement as of date                                         $ 322.0
Permian region                                          
Acquisitions, dispositions and other transactions                                          
Number of acres acquired | a   35,000                       100,000              
Cash paid on acquisition   $ 2,000.0                       $ 1,300.0              
Senior notes                                          
Acquisitions, dispositions and other transactions                                          
Debt instrument issued $ 1,500.0           $ 2,750.0           $ 1,500.0                
Net proceeds from issuance of long-term debt 1,490.0           2,720.0           1,480.0                
3.00% senior notes due 2027                                          
Acquisitions, dispositions and other transactions                                          
Debt instrument issued $ 750.0                                        
Debt instrument interest rate stated percentage 3.00%                                     3.00%  
4.10% senior notes due 2047                                          
Acquisitions, dispositions and other transactions                                          
Debt instrument issued $ 750.0                                        
Debt instrument interest rate stated percentage 4.10%                                     4.10%  
1.75% senior notes due 2017                                          
Acquisitions, dispositions and other transactions                                          
Debt instrument interest rate stated percentage           1.75%                             1.75%
Early repayment of debt through exercise of redemption option           $ 1,250.0                              
4.125% senior notes due 2016                                          
Acquisitions, dispositions and other transactions                                          
Debt instrument interest rate stated percentage         4.125%                         4.125%     4.125%
Retired debt         $ 750.0                                
2.60% senior notes due 2022                                          
Acquisitions, dispositions and other transactions                                          
Debt instrument issued             $ 400.0                            
Debt instrument interest rate stated percentage             2.60%                         2.60%  
3.40% senior notes due 2026                                          
Acquisitions, dispositions and other transactions                                          
Debt instrument issued             $ 1,150.0                            
Debt instrument interest rate stated percentage             3.40%                         3.40%  
4.40% senior notes due 2046                                          
Acquisitions, dispositions and other transactions                                          
Debt instrument issued             $ 1,200.0                            
Debt instrument interest rate stated percentage             4.40%                         4.40%  
2.50% senior notes due 2016                                          
Acquisitions, dispositions and other transactions                                          
Debt instrument interest rate stated percentage                 2.50%                       2.50%
Maturities of Senior Debt                 $ 700.0                        
3.50% senior unsecured notes due 2025                                          
Acquisitions, dispositions and other transactions                                          
Debt instrument issued                         $ 750.0                
Debt instrument interest rate stated percentage                         3.50%             3.50% 3.50%
4.625% senior unsecured notes due 2045                                          
Acquisitions, dispositions and other transactions                                          
Debt instrument issued                         $ 750.0                
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               $ 78.0                          
Percentage of common stock distributed                             81.30%            
South Texas Eagle Ford non-operated properties | Disposed of by sale                                          
Acquisitions, dispositions and other transactions                                          
Sale consideration     $ 63.0                                    
Pre-tax gain on disposal     $ 59.0                                    
Hugoton Field operations                                          
Acquisitions, dispositions and other transactions                                          
Pre-tax gain on sale of property                               $ 531.0          
Pre-tax proceeds from sale of assets                               $ 1,300.0 $ 1,400.0        
Williston operations                                          
Acquisitions, dispositions and other transactions                                          
Proceeds from sale of property held-for-sale                     $ 590.0                    
Piceance operations                                          
Acquisitions, dispositions and other transactions                                          
Sale consideration                                         $ 155.0
Piceance operations | Disposed of by sale                                          
Acquisitions, dispositions and other transactions                                          
Sale consideration               153.0                     $ 153.0    
Pre-tax gain on disposal               $ 121.0                          
Southern leg of BridgeTex Pipeline                                          
Acquisitions, dispositions and other transactions                                          
Proceeds from sale                             $ 75.0            
Westwood building                                          
Acquisitions, dispositions and other transactions                                          
Proceeds from sale of building                       $ 65.0                  
Occidental Tower building                                          
Acquisitions, dispositions and other transactions                                          
Proceeds from sale of building                   85.0                      
Pre-tax gain on sale of property                   $ 57.0                      
General Partner of Plains All American Pipeline,L.P                                          
Acquisitions, dispositions and other transactions                                          
Proceeds from sale                             1,700.0            
Gain on sale of equity investments                             $ 1,400.0            
BridgeTex                                          
Acquisitions, dispositions and other transactions                                          
Number of transactions involved in sale                             2            
Proceeds from sale                             $ 1,075.0            
Gain on sale of equity investments                             $ 633.0