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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Restricted Cash and Cash Equivalents Items      
Non-Cash Settlement of Tax Liability $ 0 $ (19) $ (8)
Settlement of affiliate liability - related party payables 0 (12) 0
Proceeds from Contributions from Affiliates 0 (7) 0
Deemed contribution (distribution) to Parent 0 68 0
Capital Expenditures Incurred but Not yet Paid 11 13 11
Interest Paid, Excluding Capitalized Interest, Operating Activities 23 43 75
Affiliated Entity      
Restricted Cash and Cash Equivalents Items      
Increase (Decrease) in Notes Receivables 0 0 18
Dividends and Interest Paid $ 23 $ 13 $ 0