POSTRETIREMENT BENEFITS AND EMPLOYEE STOCK OWNERSHIP PLAN - TOTAL BENEFIT PAYMENTS EXPECTED TO BE PAID (Details) $ in Millions	Jun. 30, 2022 USD ($)
Pension Plan
EXPECTED BENEFIT PAYMENTS
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	$ 571
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	564
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	590
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	585
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	601
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	3,459
Other Retiree Benefits
EXPECTED BENEFIT PAYMENTS
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	177
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	186
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	190
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	193
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	198
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	$ 1,076