ESTIMATES, SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND BALANCE SHEET DETAIL Estimates, Significant Accounting Policies and Balance Sheet Detail - Cash and Cash Equivalents (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted Cash and Cash Equivalents Items
Non-Cash Settlement of Tax Liability	$ 0	$ 0	$ (19)
Settlement of affiliate liability - related party payables	(4)	0	(12)
Proceeds from Contributions from Affiliates	0	0	(7)
Deemed contribution (distribution) to Parent	0	0	68
Capital Expenditures Incurred but Not yet Paid	4	11	13
Interest Paid, Excluding Capitalized Interest, Operating Activities	16	23	43
Affiliated Entity
Restricted Cash and Cash Equivalents Items
Dividends and Interest Paid	$ 33	$ 23	$ 13