Quarterly report [Sections 13 or 15(d)]

PENSION AND OTHER POSTRETIREMENT BENEFITS - Schedule of Components of Net Periodic Pension and Other Postretirement Benefit Cost (Details)

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PENSION AND OTHER POSTRETIREMENT BENEFITS - Schedule of Components of Net Periodic Pension and Other Postretirement Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
OPEB        
Components of Net Periodic Benefit Cost        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 1 2 2 3
Expected return on plan assets 0 0 0 0
Amortization of prior service cost 0 0 0 0
Recognized net actuarial loss (gain) (1) (2) (2) (3)
Net periodic benefit expense 0 0 0 0
U.S. Plans | Pension        
Components of Net Periodic Benefit Cost        
Service cost 34 33 69 66
Interest cost 44 44 88 87
Expected return on plan assets (70) (67) (140) (134)
Amortization of prior service cost 1 0 1 1
Recognized net actuarial loss (gain) 2 3 5 5
Net periodic benefit expense 11 13 23 25
U.K. Plans | Pension        
Components of Net Periodic Benefit Cost        
Service cost 4 3 7 7
Interest cost 19 20 39 38
Expected return on plan assets (25) (23) (50) (45)
Amortization of prior service cost 1 1 1 1
Recognized net actuarial loss (gain) 8 6 17 13
Net periodic benefit expense $ 7 $ 7 $ 14 $ 14