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Amount of (increase) decrease to benefit obligation of defined benefit plan from remeasurement due to settlement. Excludes decrease to benefit obligation for settlement payment.

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement.

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Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan, for assets transferred into (out of) Level 3 of fair value hierarchy. Includes, but is not limited to, transfer due to change in observability of significant inputs.

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RETIREMENT BENEFITS - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Mar. 11, 2021	Mar. 10, 2021
Defined Benefit Plan Disclosure [Line Items]
Number of employees covered, percentage			51.00%
Discount rate	2.71%		2.89%	2.57%	3.11%
(Increase) decrease for remeasurement due to settlement	$ (162)
Amount attributable to other comprehensive income	119
Level 3
Defined Benefit Plan Disclosure [Line Items]
Transfers to (from) Level 3				$ (14)
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Settlement gain (loss) included in other (income) expense	$ (1)	$ 0		$ (1)	$ 13
Discount rate	2.71%		2.89%	2.57%	3.11%
Employer contributions to the pension plans			$ 25	$ 49	$ 42
Expected employer cash contributions to the pension plan			21
Actuarial (gain) loss			$ 62	$ (113)
Expected cash contributions for current fiscal year						$ 25	$ 46