Quarterly report pursuant to Section 13 or 15(d)

ASSET RETIREMENT OBLIGATIONS - Summary Of Asset Retirement Obligations (Details)

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ASSET RETIREMENT OBLIGATIONS - Summary Of Asset Retirement Obligations (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Environmental Exit Cost [Line Items]        
Asset reitrement obligations $ 310 $ 342 $ 181 $ 165
Less: current portion 12 7    
Long-term asset retirement obligations 298 335    
Operating Segments        
Environmental Exit Cost [Line Items]        
Asset reitrement obligations $ 158 $ 190