VARIABLE INTEREST ENTITIES (Schedule of Consolidated Variable Interest Entities, Carrying Amounts of Assets and Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Apr. 30, 2019	Dec. 31, 2018
Variable Interest Entity [Line Items]
Variable Interest Entity Purchase Amount		$ 312
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Assets, Pledged	$ 807		$ 869
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	503		396
Variable Interest Entity, Primary Beneficiary [Member] | Cash and cash equivalents
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Assets, Current, Pledged			71
Variable Interest Entity, Primary Beneficiary [Member] | Other current assets
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Assets, Current, Pledged	101		101
Variable Interest Entity, Primary Beneficiary [Member] | Net property
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Assets, Noncurrent, Pledged	657		683
Variable Interest Entity, Primary Beneficiary [Member] | Other noncurrent assets
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Assets, Noncurrent, Pledged	23		14
Variable Interest Entity, Primary Beneficiary [Member] | Current liabilities
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Liabilities, Current	436		307
Variable Interest Entity, Primary Beneficiary [Member] | Long-term debt
Variable Interest Entity [Line Items]
Variable interest entities nonrecourse			75
Variable Interest Entity, Primary Beneficiary [Member] | Other noncurrent obligations
Variable Interest Entity [Line Items]
Variable Interest Entity, Consolidated, Liabilities, Noncurrent	$ 22		$ 14