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ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS - NARRATIVE (Details)
ft² in Thousands, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 23, 2019
USD ($)
Dec. 31, 2019
USD ($)
Nov. 30, 2019
USD ($)
ft²
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Jul. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Apr. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
divestiture
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Aug. 08, 2019
USD ($)
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                            
Proceeds from real estate assets disposed   $ 565                        
Finance lease   $ 398                 $ 398     $ 86
Acquisition cost                     $ 6,441 $ 5,020 $ 3,651  
Seminole-San Andres EOR                            
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                            
Cost of acquired business assets                   $ 600        
Previously Leased Power And Steam Cogeneration Facility                            
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                            
Acquisition cost           $ 443                
Ecopetrol Joint Venture                            
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                            
Area of development in joint venture | ft²     97                      
Ownership percentage in joint venture     51.00%                      
Plains All American Pipeline, LP                            
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                            
Net proceeds from sale of equity investment       $ 646                    
Pre-tax gain on sale of equity investment $ 114                          
Ecopetrol | Ecopetrol Joint Venture                            
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                            
Amount due at closing     $ 750                      
Carried capital     $ 750                      
Minority interest in new venture     49.00%                      
Gain on sale     $ 563                      
Percentage share of capital expenditures     75.00%                      
Share of capital expenditures (up to)     $ 750                      
Failed Sale-Leaseback                            
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                            
Lease term   13 years                 13 years      
Finance lease   $ 300                 $ 300      
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Non Core Midstream Assets                            
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                            
Sale consideration         $ 2,600   $ 150              
Proceeds received for divested assets         2,400                  
Pre-tax net gain from divestiture         $ 907   $ 43              
Disposed of by sale | Mozambique LNG Assets                            
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                            
Sale consideration       $ 4,200                    
Disposed of by sale | Non-strategic acreage in Permian Basin Counties                            
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                            
Sale consideration                   $ 600        
Number of divestitures of non-strategic acreage | divestiture                   2        
Pre-tax gain on disposal                   $ 81        
Disposed of by sale | Non-core Permian acreage                            
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                            
Sale consideration                 $ 90       90  
Pre-tax gain on disposal                 55          
Disposed of by sale | South Texas operations                            
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                            
Sale consideration               $ 500            
Pre-tax gain on disposal               $ 500            
Assets held for sale | Non-core Permian acreage                            
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                            
Sale consideration                 $ 500       $ 500