NEW ACCOUNTING PRONOUNCEMENTS AND POLICIES - U.S. TAX REFORM (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Jun. 30, 2019	Jun. 30, 2018	Jan. 01, 2018
Income Tax Expense (Benefit)	$ 713	$ 780	$ 3,066	$ 2,338
U.S. Tax Cuts and Jobs Act, Effective 2018
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount			210
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Base Rate, Percent							21.00%
Income Tax Expense (Benefit)			650
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount			3,900
Deferred Federal Income Tax Expense (Benefit)			$ 3,200
U.S. Tax Cuts and Jobs Act, Effective 2018 | Scenario, Forecast
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent					21.00%	28.00%