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PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS - Pension Plan Amendments (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Oct. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Payment for participants				$ 252
Settlement charges	$ 43	$ 755	$ 2	$ 46	$ 755
Pension benefits
Defined Benefit Plan Disclosure [Line Items]
Pension plan liabilities						$ 2,400

X

- Definition

Amount of liability, recognized in statement of financial position, for defined benefit pension plan. Excludes other postretirement benefit plan.

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- Definition

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 of cash outflow for pension benefit. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree. Excludes other postretirement benefit.

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