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RETIREMENT BENEFITS PLANS - Changes in Pension and Other Postretirement Liabilities Recognized in AOCI (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Pension plans | United States |  |
Changes in pension and other postretirement benefit liabilities recognized in Accumulated other comprehensive loss |  |
Balance at January 1 | $ 909 | $ 871
Prior service cost arising during the year | 0 | 2
Net loss (gain) arising during the year | (4) | 86
Currency translation | 0 | 0
Less amounts included in expense during the year | (55) | (50)
Net change for the year | (59) | 38
Balance at December 31 | 850 | 909
Pension plans | Non-United States plans |  |
Changes in pension and other postretirement benefit liabilities recognized in Accumulated other comprehensive loss |  |
Balance at January 1 | 684 | 661
Prior service cost arising during the year | 10 | (3)
Net loss (gain) arising during the year | 30 | 62
Currency translation | 54 | (18)
Less amounts included in expense during the year | (25) | (18)
Net change for the year | 69 | 23
Balance at December 31 | 753 | 684
Other postretirement benefits expense (income) |  |
Changes in pension and other postretirement benefit liabilities recognized in Accumulated other comprehensive loss |  |
Balance at January 1 | (87) | (93)
Prior service cost arising during the year | 0 | 0
Net loss (gain) arising during the year | 1 | (7)
Currency translation | 1 | 0
Less amounts included in expense during the year | 13 | 13
Net change for the year | 15 | 6
Balance at December 31 | $ (72) | $ (87)

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