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DIVESTITURES AND OTHER TRANSACTIONS - NARRATIVE (Details)
ft² in Thousands, a in Millions, $ in Millions
1 Months Ended 2 Months Ended 12 Months Ended
Sep. 23, 2019
USD ($)
Dec. 31, 2020
USD ($)
Oct. 31, 2020
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 ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Aug. 31, 2020
USD ($)
a
Mar. 31, 2019
USD ($)
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                              
Proceeds from real estate assets disposed       $ 565                      
Finance lease   $ 358               $ 358 $ 358        
Acquisition cost                     $ 2,619 $ 6,453 $ 5,020    
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 13 years        
Finance lease   $ 300   $ 300           $ 300 $ 300 $ 300      
Disposed of by sale | Oil and Gas Columbia Assets                              
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                              
Loss on sale   $ 353                          
Disposed of by sale | Non-core Permian acreage                              
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                              
Loss on sale                   $ 820          
Disposed of by sale | Wyoming, Colorado, and Utah Assets                              
ACQUISITIONS, DISPOSITIONS AND OTHER TRANSACTIONS                              
Loss on sale     $ 440                        
Area of land sold (in acres) | a                           4.5  
Area of fee surface acres (in acres) | a                           1.0  
Sale consideration                           $ 1,330  
Liabilities associated with sale     329                        
Proceeds received for divested assets     $ 1,000                        
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