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Annual report pursuant to Section 13 and 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
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Environmental Exit Cost [Line Items] Ìý Ìý Ìý
Asset Retirement Obligation $ 342 $ 165 $ 172
Asset Retirement Obligation, Current 7 2 Ìý
Asset Retirement Obligations, Noncurrent 335 163 Ìý
Operating Segments [Member] Ìý Ìý Ìý
Environmental Exit Cost [Line Items] Ìý Ìý Ìý
Asset Retirement Obligation $ 190 $ 22 Ìý