POSTRETIREMENT BENEFITS AND EMPLOYEE STOCK OWNERSHIP PLAN - FAIR VALUE OF PLAN ASSETS (Details) - USD ($) $ in Millions		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Pension Plan
ASSETS AT FAIR VALUE
Defined Benefit Plan, Plan Assets, Amount	[1]	$ 10,374	$ 10,173	$ 13,041
Pension Plan | Fair Value, Inputs, Level 1, 2 and 3 [Member]
ASSETS AT FAIR VALUE
Defined Benefit Plan, Plan Assets, Amount		1,337	1,717
Pension Plan | Cash and Cash Equivalents | Fair Value, Inputs, Level 1
ASSETS AT FAIR VALUE
Defined Benefit Plan, Plan Assets, Amount		54	78
Pension Plan | Company Stock | Fair Value, Inputs, Level 1
ASSETS AT FAIR VALUE
Defined Benefit Plan, Plan Assets, Amount		0	0
Pension Plan | Company Preferred Stock | Fair Value, Inputs, Level 2
ASSETS AT FAIR VALUE
Defined Benefit Plan, Plan Assets, Amount	[2]	0	0
Pension Plan | Fixed Income Securities | Fair Value, Inputs, Level 2
ASSETS AT FAIR VALUE
Defined Benefit Plan, Plan Assets, Amount	[3]	1,190	1,545
Pension Plan | Insurance Contracts [Domain] | Fair Value, Inputs, Level 3
ASSETS AT FAIR VALUE
Defined Benefit Plan, Plan Assets, Amount	[4]	93	94
Pension Plan | Other Assets | Fair Value Measured at Net Asset Value Per Share [Member]
ASSETS AT FAIR VALUE
Defined Benefit Plan, Plan Assets, Amount	[5]	9,037	8,456
Other Retiree Benefits
ASSETS AT FAIR VALUE
Defined Benefit Plan, Plan Assets, Amount	[6]	7,324	6,889	$ 6,444
Other Retiree Benefits | Fair Value, Inputs, Level 1, 2 and 3 [Member]
ASSETS AT FAIR VALUE
Defined Benefit Plan, Plan Assets, Amount		7,237	6,789
Other Retiree Benefits | Cash and Cash Equivalents | Fair Value, Inputs, Level 1
ASSETS AT FAIR VALUE
Defined Benefit Plan, Plan Assets, Amount		148	130
Other Retiree Benefits | Company Stock | Fair Value, Inputs, Level 1
ASSETS AT FAIR VALUE
Defined Benefit Plan, Plan Assets, Amount		368	319
Other Retiree Benefits | Company Preferred Stock | Fair Value, Inputs, Level 2
ASSETS AT FAIR VALUE
Defined Benefit Plan, Plan Assets, Amount	[2]	6,721	6,340
Other Retiree Benefits | Fixed Income Securities | Fair Value, Inputs, Level 2
ASSETS AT FAIR VALUE
Defined Benefit Plan, Plan Assets, Amount	[3]	0	0
Other Retiree Benefits | Insurance Contracts [Domain] | Fair Value, Inputs, Level 3
ASSETS AT FAIR VALUE
Defined Benefit Plan, Plan Assets, Amount	[4]	0	0
Other Retiree Benefits | Other Assets | Fair Value Measured at Net Asset Value Per Share [Member]
ASSETS AT FAIR VALUE
Defined Benefit Plan, Plan Assets, Amount	[5]	$ 87	$ 100

[1] Primarily non-U.S.-based defined benefit retirement plans.

[2] Company preferred stock is valued based on the value of Company common stock and is presented net of ESOP debt discussed below.

[3] Fixed income securities are estimated by using pricing models or quoted prices of securities with similar characteristics.

[4] Fair values of insurance contracts are valued based on either their cash equivalent value or models that project future cash flows and discount the future amounts to a present value using market-based observable inputs, including credit risk and interest rate curves. The activity for Level 3 assets is not significant for all years presented.

[5] Investments valued using net asset value as a practical expedient are primarily equity and fixed income collective funds.

[6] Primarily U.S.-based other postretirement benefit plans.