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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, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost for benefits earned | $ 94 | $ 144 | $ 284 | $ 432
Interest cost | 228 | 173 | 685 | 519
Expected return on plan assets | (245) | (297) | (736) | (892)
Amortization of prior service cost | (1) | (1) | (3) | (3)
Amortization of net actuarial loss | 1 | 0 | 1 | 1
Net periodic benefit cost | 77 | 19 | 231 | 57
Regulatory account transfer | 6 | 64 | 19 | 191
Net periodic benefit cost | 83 | 83 | 250 | 248
Other Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost for benefits earned | 10 | 15 | 29 | 46
Interest cost | 18 | 13 | 55 | 40
Expected return on plan assets | (33) | (32) | (99) | (97)
Amortization of prior service cost | 1 | 2 | 2 | 5
Amortization of net actuarial loss | (5) | (10) | (14) | (30)
Net periodic benefit cost | (9) | (12) | (27) | (36)
Regulatory account transfer | 0 | 0 | 0 | 0
Net periodic benefit cost | $ (9) | $ (12) | $ (27) | $ (36)

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