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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Narrative (Details) - USD ($) $ in Millions	8 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2021	Sep. 30, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plan [Line Items]
Company match percentage			7.00%
Contributions			$ 91	$ 83	$ 84
Reduction in accumulated postretirement benefit obligation related to plan amendment		$ 156
Adjustment to OCI		118
Deferred taxes		$ 39
Amortization period for reduction of future net periodic cost		3 years 4 months 24 days
Actuarial loss				$ 12
Common Stock
Defined Benefit Plans and Other Postretirement Benefit Plan [Line Items]
Contributions	$ 48
United States Pension Benefits \| Postretirement Health Coverage
Defined Benefit Plans and Other Postretirement Benefit Plan [Line Items]
Service requirement			10 years
Plan, age requirement			55 years
United States Pension Benefits \| Pension Benefits \| Equity Securities
Defined Benefit Plans and Other Postretirement Benefit Plan [Line Items]
Target plan asset allocations	20.00%		20.00%
United States Pension Benefits \| Pension Benefits \| Fixed Income Funds
Defined Benefit Plans and Other Postretirement Benefit Plan [Line Items]
Target plan asset allocations	80.00%		80.00%