POSTRETIREMENT BENEFIT PLANS - Effect on Operations of Pension Plans (Details) - Principal pension - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Defined Benefit Plan Disclosure [Line Items]
Service cost for benefits earned	$ 19	$ 21
Prior service cost amortization	(2)	3
Expected return on plan assets	(375)	(578)
Interest cost on benefit obligations	325	453
Net actuarial gain amortization	(128)	(155)
Net periodic expense (income)	(161)	(256)
Discontinued operations
Defined Benefit Plan Disclosure [Line Items]
Net periodic expense (income)	0	(88)
Continuing operations
Defined Benefit Plan Disclosure [Line Items]
Net periodic expense (income)	$ (161)	$ (168)

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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