PENSIONS AND OTHER POSTRETIREMENT BENEFITS - Pension and Other Postretirement Benefits (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Sep. 30, 2024 |
Mar. 31, 2024 |
Sep. 30, 2023 |
Sep. 30, 2024 |
Sep. 30, 2023 |
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| Pension Plan | Ìý | Ìý | Ìý | Ìý | Ìý |
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý |
| Service cost | $ 7 | Ìý | $ 8 | $ 21 | $ 24 |
| Interest cost | 54 | Ìý | 59 | 163 | 176 |
| Expected return on plan assets | (80) | Ìý | (79) | (240) | (236) |
| Prior service credits | 5 | Ìý | 5 | 13 | 13 |
| Net actuarial loss (gain) | 0 | Ìý | 0 | 0 | 2 |
| Net periodic benefit costs (credits) | (14) | Ìý | (7) | (43) | (21) |
| Defined benefit pension contributions | 75 | Ìý | 0 | 91 | 0 |
| Defined benefit plan | Ìý | Ìý | Ìý | Ìý | Ìý |
| Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | Ìý | Ìý | Ìý | Ìý | Ìý |
| Service cost | 2 | Ìý | 2 | 6 | 7 |
| Interest cost | 13 | Ìý | 15 | 38 | 47 |
| Expected return on plan assets | (11) | Ìý | (10) | (32) | (31) |
| Termination benefits | 0 | $ 2 | 0 | 2 | 0 |
| Prior service credits | (4) | Ìý | (4) | (12) | (12) |
| Net actuarial loss (gain) | (39) | Ìý | (36) | (116) | (109) |
| Net periodic benefit costs (credits) | (39) | Ìý | (33) | (114) | (98) |
| OPEB contributions | $ 0 | Ìý | $ 0 | $ 0 | $ 0 |
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition 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. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of defined benefit plan cost (credit), classified as other. No definition available.
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Amount of cash outflow for other postretirement benefit. Includes, but is not limited to, employer contribution to fund plan asset and payment to retiree. Excludes pension benefit. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition 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. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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