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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, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Pension Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost for benefits earned | $ 147 | $ 133 | $ 440 | $ 397
Interest cost | 161 | 178 | 484 | 535
Expected return on plan assets | (261) | (261) | (784) | (783)
Amortization of prior service cost | (1) | (1) | (4) | (4)
Amortization of net actuarial loss | 1 | 1 | 4 | 3
Net periodic benefit cost | 47 | 50 | 140 | 148
Regulatory account transfer | 37 | 34 | 111 | 102
Total | 84 | 84 | 251 | 250
Other Benefits |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost for benefits earned | 15 | 15 | 47 | 46
Interest cost | 13 | 16 | 39 | 47
Expected return on plan assets | (33) | (34) | (103) | (103)
Amortization of prior service cost | 3 | 3 | 10 | 10
Amortization of net actuarial loss | (8) | (5) | (24) | (15)
Net periodic benefit cost | (10) | (5) | (31) | (15)
Regulatory account transfer | 0 | 0 | 0 | 0
Total | $ (10) | $ (5) | $ (31) | $ (15)

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