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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Components of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost for benefits earned $ 106 $ 99
Interest cost 252 229
Expected return on plan assets (263) (253)
Amortization of prior service (credit) (1) (1)
Amortization of net actuarial gain 0 0
Net periodic benefit cost 94 74
Regulatory account transfer (10) 10
Net periodic benefit cost 84 84
Other Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Service cost for benefits earned 9 10
Interest cost 18 18
Expected return on plan assets (37) (35)
Amortization of prior service (credit) 1 1
Amortization of net actuarial gain (6) (6)
Net periodic benefit cost (15) (12)
Regulatory account transfer 0 0
Net periodic benefit cost $ (15) $ (12)