INCOME TAXES - ADDITIONAL INFORMATION (Details) $ in Millions	12 Months Ended				144 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($) countries audit	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2019 USD ($) countries	Jun. 30, 2037 USD ($)	Jan. 01, 2018
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%	28.10%	35.00%
Income Tax Expense (Benefit)		$ 2,103	$ 3,465	$ 3,063
Deferred Federal Income Tax Expense (Benefit)		(296)	(1,989)	28
Income Tax Effects Allocated Directly to Equity		80	342
Deferred Tax Liabilities, Undistributed Foreign Earnings		27,000			$ 27,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate		$ 159			$ 159
Number of Countries With On The Ground Operations | countries		70			70
Number of Income Tax Jurisdiction | countries		150			150
Open Tax Year					2008
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	$ 140	$ 37	45	381
Unrecognized Tax Benefits, Interest on Income Taxes Accrued		133	99	100	$ 133
Unrecognized Tax Benefits, Income Tax Penalties Accrued		17	15	20	17
Unrecognized Tax Benefits, Interest on Income Taxes Expense		40	22	62
Unrecognized Tax Benefits, Income Tax Penalties Expense		2	5	$ 0
Operating Loss Carryforwards		$ 3,500	$ 3,500		3,500
Minimum
Number of Jurisdictional Audits | audit		40
Maximum
Number of Jurisdictional Audits | audit		50
U.S. Tax Cuts and Jobs Act, Effective 2018
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%	28.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Base Rate, Percent							21.00%
Income Tax Expense (Benefit)		$ 602
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount		3,800
Deferred Federal Income Tax Expense (Benefit)		3,200
Net Operating Loss, Expiring Within 20 Years | Minimum
Operating Loss Carryforwards		1,000			1,000
Net Operating Loss, Indefinite Life
Operating Loss Carryforwards		$ 2,500			$ 2,500
Subsequent Event | Net Operating Loss, Expiring Within 20 Years | Maximum
Operating Loss Carryforwards						$ 1,200