INCOME TAXES (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2019	Jun. 30, 2018
Income Tax Contingency [Line Items]
Effective tax rate on earnings from continuing operations	(3.10%)	34.10%	15.90%	33.00%
Remeasurement of deferred tax liabilities for change in tax rate	$ 33		$ 33
Remeasurement of deferred tax liabilities for tax on foreign unremitted earnings, related deferred foreign tax credits and related unrealized foreign exchange gains and losses	27		27
Remeasurement of deferred tax liabilities	60		60
Provisional on-time transition tax expense on accumulated foreign earnings, net of applicable foreign tax credits	7		7
Benefit related to current year taxable income	28		28
Total Tax Cuts and Jobs Act of 2017, provisional income tax benefit	$ 81		$ 81
Scenario, Forecast [Member]
Income Tax Contingency [Line Items]
Federal statutory tax rate					21.00%	28.10%