PENSION AND OTHER POST-EMPLOYMENT BENEFIT PLANS - Additional Information (Details) - Pension $ in Millions	3 Months Ended
	Jun. 30, 2021 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, increase (decrease) in beginning of the year fair value of the pension assets	$ 155
Defined benefit plan, increase (decrease) in beginning of the year fair value of the pension assets, percentage	5.00%
Defined benefit plan, increase (decrease) in projected benefit obligation	$ 17
Defined benefit plan, improvement in funded status	$ 138
Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, increase (decrease) in projected benefit obligation, percentage	1.00%