Quarterly report [Sections 13 or 15(d)]

EMPLOYEE BENEFIT PLANS - Net Periodic Benefit Cost for Pension and Postretirement Benefit Plans (Details)

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EMPLOYEE BENEFIT PLANS - Net Periodic Benefit Cost for Pension and Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Defined Benefit Pension Plan | U.S. Pension Benefits    
Net Periodic Cost:    
Service cost $ 269 $ 281
Interest cost 700 679
Expected return on assets (823) (777)
Amortization of prior service cost 37 39
Net periodic benefit cost 183 222
Defined Benefit Pension Plan | International Pension Benefits    
Net Periodic Cost:    
Service cost 9 9
Interest cost 17 16
Expected return on assets (22) (20)
Amortization of prior service cost 0 0
Net periodic benefit cost 4 5
U.S. Postretirement Medical Benefits | U.S. Pension Benefits    
Net Periodic Cost:    
Service cost 4 4
Interest cost 25 27
Expected return on assets (1) (1)
Amortization of prior service cost 0 0
Net periodic benefit cost $ 28 $ 30