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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Pension Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost for benefits earned | $ 99 | $ 95
Interest cost | 229 | 228
Expected return on plan assets | (253) | (245)
Amortization of prior service cost (credit) | (1) | (1)
Amortization of net actuarial gain | 0 | 0
Net periodic benefit cost | 74 | 77
Regulatory account transfer | 10 | 6
Net periodic benefit cost | 84 | 83
Other Benefits |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost for benefits earned | 10 | 10
Interest cost | 18 | 18
Expected return on plan assets | (35) | (33)
Amortization of prior service cost (credit) | 1 | 1
Amortization of net actuarial gain | (6) | (5)
Net periodic benefit cost | (12) | (9)
Regulatory account transfer | 0 | 0
Net periodic benefit cost | $ (12) | $ (9)

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