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 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
OPEB        
Components of Net Periodic Benefit Cost        
Service cost $ 0 $ 0 $ 0 $ 0
Interest cost 2 2 4 5
Expected return on plan assets 0 0 0 0
Amortization of prior service cost     0 0
Recognized net actuarial loss (gain) (2) (1) (4) (4)
Net periodic benefit expense 0 1 0 1
U.S. Plans | Pension        
Components of Net Periodic Benefit Cost        
Service cost 35 34 104 100
Interest cost 45 43 133 130
Expected return on plan assets (71) (67) (211) (201)
Amortization of prior service cost     1 1
Recognized net actuarial loss (gain) 3 2 8 7
Net periodic benefit expense 12 12 35 37
U.K. Plans | Pension        
Components of Net Periodic Benefit Cost        
Service cost 4 4 11 11
Interest cost 19 20 58 58
Expected return on plan assets (25) (23) (75) (68)
Amortization of prior service cost     1 1
Recognized net actuarial loss (gain) 9 7 26 20
Net periodic benefit expense $ 7 $ 8 $ 21 $ 22