INCOME TAXES - ADDITIONAL INFORMATION (Details) $ in Millions	12 Months Ended
	Jun. 30, 2020 USD ($) audit countries	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2037 USD ($)	Jan. 01, 2018
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	28.10%
Income Tax Expense (Benefit)	$ 2,731	$ 2,103	$ 3,465
Deferred Federal Income Tax Expense (Benefit)	39	(296)	(1,989)
Income Tax Effects Allocated Directly to Equity	18	80
Deferred Tax Liabilities, Undistributed Foreign Earnings	19,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 278
Number of Countries With On The Ground Operations | countries	70
Number of Income Tax Jurisdiction | countries	150
Open Tax Year	2008
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	$ 83	37	45
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	141	133	99
Unrecognized Tax Benefits, Income Tax Penalties Accrued	17	17	15
Unrecognized Tax Benefits, Interest on Income Taxes Expense	39	40	22
Unrecognized Tax Benefits, Income Tax Penalties Expense	1	2	$ 5
Operating Loss Carryforwards	$ 2,900	$ 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	$ 900
Net Operating Loss, Indefinite Life | Maximum
Operating Loss Carryforwards	$ 2,000
Subsequent Event | Net Operating Loss, Expiring Within 20 Years | Maximum
Operating Loss Carryforwards				$ 900