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RETIREMENT BENEFITS PLANS - Benefits Expense (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Pension plans | United States      
Defined Benefit Plans and Other Postretirement Benefit Plans      
Service cost $ 16 $ 18 $ 19
Interest cost 135 134 142
Expected return on plan assets (190) (190) (195)
Amortization 15 9 4
Total (24) (29) (30)
Settlements, curtailments, and special termination benefits 40 41 34
Total expense (income) 16 12 4
Pension plans | Non-United States plans      
Defined Benefit Plans and Other Postretirement Benefit Plans      
Service cost 45 46 43
Interest cost 88 85 85
Expected return on plan assets (128) (134) (121)
Amortization 16 11 7
Total 21 8 14
Settlements, curtailments, and special termination benefits 9 7 4
Total expense (income) 30 15 18
Other postretirement benefits expense (income)      
Defined Benefit Plans and Other Postretirement Benefit Plans      
Service cost 0 1 1
Interest cost 11 10 10
Expected return on plan assets (1) (1) (1)
Amortization (13) (13) (17)
Total (3) (3) (7)
Settlements, curtailments, and special termination benefits 0 0 0
Total expense (income) $ (3) $ (3) $ (7)