POSTRETIREMENT BENEFIT PLANS - Schedule of Defined Benefit Plans (Details) - USD ($) $ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Jan. 01, 2023 |
|---|---|---|---|---|
| Accumulated Benefit Obligations and Unrecognized Gain | ||||
| Accumulated benefit obligation | $ 22,595 | $ 22,185 | $ 22,906 | |
| Unrecognized gain recorded in AOCI | 2,481 | |||
| Net Benefit Liability | ||||
| Projected benefit obligations | 22,953 | |||
| Fair value of plan assets | 18,908 | |||
| Net liability | 4,045 | |||
| Pension Plans | ||||
| Accumulated Benefit Obligations and Unrecognized Gain | ||||
| Accumulated benefit obligation | 21,696 | |||
| Unrecognized gain recorded in AOCI | 1,258 | |||
| Net Benefit Liability | ||||
| Projected benefit obligations | 21,743 | |||
| Fair value of plan assets | 18,908 | |||
| Net liability | 2,835 | |||
| Other Postretirement Benefits Plan | ||||
| Accumulated Benefit Obligations and Unrecognized Gain | ||||
| Accumulated benefit obligation | 1,210 | |||
| Unrecognized gain recorded in AOCI | 1,223 | |||
| Net Benefit Liability | ||||
| Projected benefit obligations | 908 | 1,016 | $ 1,133 | 1,210 |
| Fair value of plan assets | 0 | 0 | $ 0 | 0 |
| Net liability | $ 908 | $ 1,016 | $ 1,210 |
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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- Definition Amount, after tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References No definition available.
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