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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ASSET RETIREMENT OBLIGATIONS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Asset retirement obligation    
Beginning balance $ 1,499 $ 1,312
Liabilities assumed in the Acquisition 3,344 0
Liabilities incurred – capitalized to PP&E 131 31
Liabilities settled and paid (200) (40)
Accretion expense 71 67
Acquisitions, dispositions and other 0 (18)
WES loss of control (359) 0
Revisions to previous estimates 147 147
Ending balance 4,633 1,499
Asset retirement obligations, current balance included in Accrued Liabilities $ 248 $ 75