v3.26.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Components of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost for benefits earned $ 115 $ 106 $ 230 $ 212
Interest cost 256 252 512 504
Expected return on plan assets (307) (264) (614) (527)
Amortization of prior service cost (credit) 0 0 (1) (1)
Amortization of net actuarial loss (gain) 0 1 1 1
Net periodic benefit cost 64 95 128 189
Regulatory account transfer 20 (10) 40 (20)
Net periodic benefit cost 84 85 168 169
Other Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost for benefits earned 11 10 22 19
Interest cost 20 19 40 37
Expected return on plan assets (39) (38) (78) (75)
Amortization of prior service cost (credit) 0 0 1 1
Amortization of net actuarial loss (gain) (4) (5) (8) (11)
Net periodic benefit cost (12) (14) (23) (29)
Regulatory account transfer 0 0 0 0
Net periodic benefit cost $ (12) $ (14) $ (23) $ (29)