PENSION AND OTHER POSTRETIREMENT BENEFIT PROGRAMS - Summary of Net-of-Tax Amounts Recorded in OCI Relating to Pension and OPEB Plans (Details) - USD ($)	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Summary of the net-of-tax amounts recorded in OCI relating to pension and OPEB plans
Gain (loss) arising during the year, net of tax of $31 in 2023, $6 in 2022 and $43 in 2021	$ 132,000,000	$ (8,000,000)	$ 161,000,000
Amortization of loss to earnings, net of tax of $(5) in 2023, $6 in 2022 and $16 in 2021	(13,000,000)	23,000,000	64,000,000
Settlement charges, net of tax of zero in 2023, 2022 and 2021	2,000,000	1,000,000	2,000,000
Pension and other employee benefits	121,000,000	16,000,000	227,000,000
Gain (loss) arising during the year, tax expense (benefit)	31,000,000	6,000,000	43,000,000
Amortization of loss to earnings, tax benefit	(5,000,000)	6,000,000	16,000,000
Settlement, tax benefit	$ 0	$ 0	$ 0

Other comprehensive income defined benefit pension plans adjustment net of tax period increase decrease.

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- Definition

Amount, after tax, of cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount of tax expense (benefit) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount of tax expense (benefit) for increase (decrease) to other comprehensive income from settlement and curtailment gain (loss) of defined benefit plan.

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- Definition

Amount, after tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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Amount of tax (expense) benefit of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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Amount, after tax, of increase (decrease) to other comprehensive income from settlement and curtailment gain (loss) of defined benefit plan.

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