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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Schedule of Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 32 $ 33 $ 95 $ 101
Interest cost 61 57 182 172
Expected return on plan assets (68) (69) (205) (207)
Amortization of unrecognized (gain) loss (2) 4 (5) 14
Amortization of prior service credit 0 0 0 0
Other 0 1 1 1
Total 23 26 68 81
Other Postretirement Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 4 4
Interest cost 8 9 24 28
Expected return on plan assets 0 0 (1) (1)
Amortization of unrecognized (gain) loss (8) (7) (23) (20)
Amortization of prior service credit (22) (23) (65) (70)
Other 0 0 0 0
Total $ (20) $ (20) $ (61) $ (59)