POSTRETIREMENT BENEFITS AND EMPLOYEE STOCK OWNERSHIP PLAN - FAIR VALUE OF PLAN ASSETS (Details) - USD ($) $ in Millions		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Pension Plan
ASSETS AT FAIR VALUE
Defined Benefit Plan, Plan Assets, Amount	[1]	$ 10,173	$ 13,041	$ 11,484
Pension Plan | Fair Value, Inputs, Level 1, 2 and 3 [Member]
ASSETS AT FAIR VALUE
Defined Benefit Plan, Plan Assets, Amount		1,717	2,124
Pension Plan | Cash and Cash Equivalents | Fair Value, Inputs, Level 1
ASSETS AT FAIR VALUE
Defined Benefit Plan, Plan Assets, Amount		78	82
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]	1,545	1,931
Pension Plan | Insurance Contracts [Domain] | Fair Value, Inputs, Level 3
ASSETS AT FAIR VALUE
Defined Benefit Plan, Plan Assets, Amount	[4]	94	111
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]	8,456	10,917
Other Retiree Benefits
ASSETS AT FAIR VALUE
Defined Benefit Plan, Plan Assets, Amount	[6]	6,889	6,444	$ 5,618
Other Retiree Benefits | Fair Value, Inputs, Level 1, 2 and 3 [Member]
ASSETS AT FAIR VALUE
Defined Benefit Plan, Plan Assets, Amount		6,789	6,320
Other Retiree Benefits | Cash and Cash Equivalents | Fair Value, Inputs, Level 1
ASSETS AT FAIR VALUE
Defined Benefit Plan, Plan Assets, Amount		130	131
Other Retiree Benefits | Company Stock | Fair Value, Inputs, Level 1
ASSETS AT FAIR VALUE
Defined Benefit Plan, Plan Assets, Amount		319	275
Other Retiree Benefits | Company Preferred Stock | Fair Value, Inputs, Level 2
ASSETS AT FAIR VALUE
Defined Benefit Plan, Plan Assets, Amount	[2]	6,340	5,911
Other Retiree Benefits | Fixed Income Securities | Fair Value, Inputs, Level 2
ASSETS AT FAIR VALUE
Defined Benefit Plan, Plan Assets, Amount	[3]	0	3
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]	$ 100	$ 124

[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, classified as Level 2, 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.