v3.26.1
POSTRETIREMENT BENEFIT PLANS - Components of Expense (Income) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Defined Benefit Plan Disclosure [Line Items]        
Non-operating $ (45) $ (73) $ (96) $ (148)
Pension Plans | U.S. Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost – Operating 1 1 2 2
Interest cost 241 249 481 497
Expected return on plan assets (275) (287) (550) (573)
Amortization of net loss (gain) 0 (20) 0 (40)
Amortization of prior service cost (credit) (3) (3) (5) (5)
Special termination cost 0 1 0 2
Non-operating (37) (59) (74) (119)
Net periodic expense (income) (36) (58) (72) (117)
Pension Plans | International Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost – Operating 5 5 9 10
Interest cost 39 38 79 74
Expected return on plan assets (40) (38) (81) (74)
Amortization of net loss (gain) 6 5 12 10
Amortization of prior service cost (credit) (1) (1) (1) (1)
Special termination cost 0 0 0 0
Non-operating 5 4 9 9
Net periodic expense (income) 9 10 18 19
Other Postretirement Benefits Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost – Operating 1 1 3 3
Interest cost 11 13 22 26
Expected return on plan assets 0 0 0 0
Amortization of net loss (gain) (14) (15) (29) (30)
Amortization of prior service cost (credit) (18) (20) (35) (40)
Special termination cost 0 0 0 1
Non-operating (21) (21) (42) (43)
Net periodic expense (income) $ (20) $ (20) $ (39) $ (40)