INCOME TAXES (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Tax Credit and Operating Loss Carryforwards [Line Items]
Statutory federal tax rate			21.00%	28.10%	35.00%
Tax Cuts And Jobs Act Of 2017, provisional income tax benefit	$ (81)	$ (81)
Unrecognized tax benefits, income tax penalties and interest accrued			$ 4	$ 5
Unrecognized tax expense (benefit), income tax penalties and interest expense			(1)	1	$ (1)
Unrecognized tax benefits that would impact effective tax rate			23	33	28
Gross unrecognized tax benefits recognized upon the expiration of the applicable statute of limitations			3	$ 2	$ 1
Domestic Tax Authority [Member] | Foreign Tax Credit Carryforward [Member]
Tax Credit and Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount			35
Foreign Tax Authority [Member] | Not Subject to Expiration [Member]
Tax Credit and Operating Loss Carryforwards [Line Items]
Operating loss carryforwards			9
Foreign Tax Authority [Member] | Not Subject to Expiration [Member] | Foreign Tax Credit Carryforward [Member]
Tax Credit and Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount			24
Foreign Tax Authority [Member] | Subject to Expiration [Member]
Tax Credit and Operating Loss Carryforwards [Line Items]
Operating loss carryforwards			$ 19