Quarterly report pursuant to Section 13 or 15(d)

ASSET RETIREMENT OBLIGATIONS - Asset Retirement Obligation Disclosure (Details)

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ASSET RETIREMENT OBLIGATIONS - Asset Retirement Obligation Disclosure (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Asset Retirement Obligation [Roll Forward]    
Asset retirement obligation at beginning of period $ 342 $ 165
Increase from Acquisitions 57 14
Accretion expense 8 5
Remediation payments (10) (1)
Asset retirement obligation at end of period $ 397 $ 183