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POSTRETIREMENT BENEFIT PLANS - Schedule of Components of Net Benefit Costs (Details) - Principal pension - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost for benefits earned | $ 13 | $ 14 | $ 25 | $ 33
Prior service cost amortization | (1) | (3) | (2) | (5)
Expected return on plan assets | (358) | (375) | (717) | (750)
Interest cost on benefit obligations | 310 | 326 | 620 | 651
Net actuarial gain amortization | (110) | (125) | (219) | (253)
Net periodic expense (income) | $ (146) | $ (163) | $ (293) | $ (324)

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