v3.26.3
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Components of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Pension Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost for benefits earned $ 115 $ 106 $ 345 $ 318
Interest cost 256 252 768 756
Expected return on plan assets (307) (263) (921) (790)
Amortization of prior service cost (credit) (1) (1) (2) (2)
Amortization of net actuarial loss (gain) 1 0 2 1
Net periodic benefit cost 64 94 192 283
Regulatory account transfer 20 (10) 61 (30)
Net periodic benefit cost 84 84 253 253
Other Benefits        
Defined Benefit Plan Disclosure [Line Items]        
Service cost for benefits earned 11 9 33 28
Interest cost 20 18 59 55
Expected return on plan assets (39) (37) (117) (112)
Amortization of prior service cost (credit) 1 1 2 2
Amortization of net actuarial loss (gain) (4) (6) (11) (17)
Net periodic benefit cost (11) (15) (34) (44)
Regulatory account transfer 0 0 0 0
Net periodic benefit cost $ (11) $ (15) $ (34) $ (44)