Quarterly report [Sections 13 or 15(d)]

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

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PENSION AND OTHER POSTRETIREMENT BENEFITS - Summary of Components of Net Periodic Pension and Other Postretirement Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
OPEB    
Components of Net Periodic Benefit Cost    
Service cost $ 0 $ 0
Interest cost 1 1
Expected return on plan assets 0 0
Amortization of prior service cost 0 0
Recognized net actuarial loss (gain) (1) (1)
Net periodic benefit expense 0 0
U.S. Plans | Pension    
Components of Net Periodic Benefit Cost    
Service cost 35 33
Interest cost 44 43
Expected return on plan assets (70) (67)
Amortization of prior service cost 0 1
Recognized net actuarial loss (gain) 3 2
Net periodic benefit expense 12 12
U.K. Plans | Pension    
Components of Net Periodic Benefit Cost    
Service cost 3 4
Interest cost 20 18
Expected return on plan assets (25) (22)
Amortization of prior service cost 0 0
Recognized net actuarial loss (gain) 9 7
Net periodic benefit expense $ 7 $ 7