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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, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost for benefits earned | $ 95 | $ 144 | $ 190 | $ 288
Interest cost | 229 | 173 | 457 | 346
Expected return on plan assets | (246) | (298) | (491) | (595)
Amortization of prior service cost | (1) | (1) | (2) | (2)
Amortization of net actuarial loss | 0 | 1 | 0 | 1
Net periodic benefit cost | 77 | 19 | 154 | 38
Regulatory account transfer | (6) | 64 | (13) | 127
Net periodic benefit cost | 71 | 83 | 141 | 165
Other Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost for benefits earned | 9 | 16 | 19 | 31
Interest cost | 19 | 14 | 37 | 27
Expected return on plan assets | (33) | (33) | (66) | (65)
Amortization of prior service cost | 0 | 1 | 1 | 3
Amortization of net actuarial loss | (4) | (10) | (9) | (20)
Net periodic benefit cost | (9) | (12) | (18) | (24)
Regulatory account transfer | 0 | 0 | 0 | 0
Net periodic benefit cost | $ (9) | $ (12) | $ (18) | $ (24)

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