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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost for benefits earned | $ 99 | $ 95 | $ 198 | $ 190
Interest cost | 229 | 229 | 458 | 457
Expected return on plan assets | (254) | (246) | (507) | (491)
Amortization of prior service (credit) | (1) | (1) | (2) | (2)
Amortization of net actuarial (gain) loss | 1 | 0 | 1 | 0
Net periodic benefit cost | 74 | 77 | 148 | 154
Regulatory account transfer | (9) | (6) | (19) | (13)
Net periodic benefit cost | 65 | 71 | 129 | 141
Other Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost for benefits earned | 11 | 9 | 21 | 19
Interest cost | 18 | 19 | 36 | 37
Expected return on plan assets | (35) | (33) | (70) | (66)
Amortization of prior service (credit) | 0 | 0 | 1 | 1
Amortization of net actuarial (gain) loss | (5) | (4) | (11) | (9)
Net periodic benefit cost | (11) | (9) | (23) | (18)
Regulatory account transfer | 0 | 0 | 0 | 0
Net periodic benefit cost | $ (11) | $ (9) | $ (23) | $ (18)

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