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 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Defined Benefit Pension Plan | U.S. Pension Benefits        
Net Periodic Cost:        
Service cost $ 267 $ 282 $ 536 $ 563
Interest cost 700 680 1,400 1,359
Expected return on assets (822) (778) (1,645) (1,555)
Amortization of prior service cost 37 39 74 78
Net periodic benefit cost 182 223 365 445
Defined Benefit Pension Plan | International Pension Benefits        
Net Periodic Cost:        
Service cost 9 9 18 18
Interest cost 17 16 34 32
Expected return on assets (22) (21) (44) (41)
Amortization of prior service cost 0 1 0 1
Net periodic benefit cost 4 5 8 10
U.S. Postretirement Medical Benefits | U.S. Pension Benefits        
Net Periodic Cost:        
Service cost 4 4 8 8
Interest cost 25 27 50 54
Expected return on assets (1) (2) (2) (3)
Amortization of prior service cost 0 0 0 0
Net periodic benefit cost $ 28 $ 29 $ 56 $ 59