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SEGMENTS - Schedule of Industry Segments and Eliminations (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
segment
Jun. 30, 2022
USD ($)
Segment Information        
Number of operating segments | segment     3  
Net sales $ 6,702 $ 10,676 $ 13,927 $ 19,025
Income (loss) before income taxes 1,327 4,986 3,061 8,069
Income tax expense (467) (1,231) (938) 562
NET INCOME 860 3,755 2,123 8,631
Gains on sales of assets, net 1 23 5 158
Black Butte Coal        
Segment Information        
Impairment of equity method investment 29   29  
Deferred Income Tax Charge        
Segment Information        
Deferred tax charges 68   68  
Land        
Segment Information        
Impairment and related charges 180   180  
Maxus Filed Bankruptcy        
Segment Information        
Gains related to legal settlements 260   260  
Oil and gas | Black Butte Coal        
Segment Information        
Impairment of equity method investment 29   29  
Oil and gas | Land        
Segment Information        
Impairment and related charges 180   180  
Operating segments | Oil and gas        
Segment Information        
Net sales 4,941 7,696 10,266 13,771
Income (loss) before income taxes 1,059 4,094 2,699 6,992
Income tax expense 0 0 0 0
NET INCOME 1,059 4,094 2,699 6,992
Gains related to legal settlements     26  
Operating segments | Oil and gas | Disposed of by sale, not discontinued operations | Permian Basin        
Segment Information        
Gains on sales of assets, net       147
Operating segments | Chemical        
Segment Information        
Net sales 1,375 1,909 2,780 3,593
Income (loss) before income taxes 436 800 908 1,471
Income tax expense 0 0 0 0
NET INCOME 436 800 908 1,471
Operating segments | Midstream and marketing        
Segment Information        
Net sales 616 1,474 1,367 2,356
Income (loss) before income taxes (30) 264 (28) 214
Income tax expense 0 0 0 0
NET INCOME (30) 264 (28) 214
Corporate and eliminations        
Segment Information        
Net sales (230) (403) (486) (695)
Income (loss) before income taxes (138) (172) (518) (608)
Income tax expense (467) (1,231) (938) 562
NET INCOME (605) (1,403) (1,456) (46)
Mark to market gain (loss) on interest rate swaps   127   262
Gain on debt extinguished   179   161
Non-cash income tax benefit from reorganization       2,600
Corporate and eliminations | Midstream and marketing        
Segment Information        
Mark to market gain (loss) on interest rate swaps $ 48 $ 96 $ 40 $ 102