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OTHER INCOME/(LOSS) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Other Income and Expenses [Abstract]        
Net periodic pension and OPEB income/(cost), excluding service cost (Note 11) $ (11) $ 14 $ 227 $ 25
Investment-related interest income 293 368 609 719
Interest income/(expense) on income taxes (8) 1 (12) (16)
Realized and unrealized gains/(losses) on cash equivalents, marketable securities, and other investments (2) 11 4 43
Gains/(Losses) on changes in investments in affiliates 8 1 5 8
Royalty income 98 107 209 214
Other 71 75 180 80
Total $ 449 $ 577 $ 1,222 $ 1,073