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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost for benefits earned | $ 99 | $ 94 | $ 297 | $ 284
Interest cost | 229 | 228 | 687 | 685
Expected return on plan assets | (254) | (245) | (761) | (736)
Amortization of prior service (credit) | 0 | (1) | (2) | (3)
Amortization of net actuarial (gain) loss | 0 | 1 | 1 | 1
Net periodic benefit cost | 74 | 77 | 222 | 231
Regulatory account transfer | (10) | 6 | (29) | 19
Net periodic benefit cost | 64 | 83 | 193 | 250
Other Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost for benefits earned | 10 | 10 | 31 | 29
Interest cost | 17 | 18 | 53 | 55
Expected return on plan assets | (35) | (33) | (105) | (99)
Amortization of prior service (credit) | 1 | 1 | 2 | 2
Amortization of net actuarial (gain) loss | (6) | (5) | (17) | (14)
Net periodic benefit cost | (13) | (9) | (36) | (27)
Regulatory account transfer | 0 | 0 | 0 | 0
Net periodic benefit cost | $ (13) | $ (9) | $ (36) | $ (27)

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