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GENERAL INFORMATION AND OTHER FINANCIAL DATA - PENSION AND OTHER POSTRETIREMENT BENEFITS (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Pension |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | $ 25 | $ 27 | $ 82 | $ 110
Interest cost | 39 | 29 | 118 | 88
Expected return on assets | (42) | (46) | (127) | (137)
Amortization of: |  |  |  |
Prior service cost (credit) | 2 | 3 | 4 | 8
Actuarial loss (gain) | 3 | 8 | 7 | 19
Net periodic benefit cost (credit) | 27 | 21 | 84 | 88
Regulatory adjustments | 30 | 87 | 88 | 84
Total expense (income) recognized | 57 | 108 | 172 | 172
Pension | San Diego Gas and Electric Company |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 8 | 8 | 24 | 28
Interest cost | 10 | 7 | 30 | 20
Expected return on assets | (9) | (13) | (29) | (35)
Amortization of: |  |  |  |
Actuarial loss (gain) | 2 | 0 | 4 | 1
Net periodic benefit cost (credit) | 11 | 2 | 29 | 14
Regulatory adjustments | 3 | 24 | 11 | 26
Total expense (income) recognized | 14 | 26 | 40 | 40
Pension | Southern California Gas Company |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 15 | 16 | 49 | 72
Interest cost | 24 | 20 | 75 | 61
Expected return on assets | (29) | (30) | (89) | (94)
Amortization of: |  |  |  |
Prior service cost (credit) | 1 | 2 | 3 | 6
Actuarial loss (gain) | 1 | 6 | 1 | 14
Net periodic benefit cost (credit) | 12 | 14 | 39 | 59
Regulatory adjustments | 27 | 63 | 77 | 58
Total expense (income) recognized | 39 | 77 | 116 | 117
PBOP |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 3 | 4 | 10 | 17
Interest cost | 9 | 7 | 28 | 21
Expected return on assets | (17) | (16) | (52) | (48)
Amortization of: |  |  |  |
Prior service cost (credit) | (1) | (1) | (2) | (2)
Actuarial loss (gain) | (5) | (4) | (17) | (11)
Net periodic benefit cost (credit) | (11) | (10) | (33) | (23)
Regulatory adjustments | 10 | 10 | 32 | 23
Total expense (income) recognized | (1) | 0 | (1) | 0
PBOP | San Diego Gas and Electric Company |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 1 | 1 | 2 | 4
Interest cost | 2 | 1 | 6 | 4
Expected return on assets | (2) | (2) | (6) | (7)
Amortization of: |  |  |  |
Actuarial loss (gain) | 0 | (1) | (1) | (2)
Net periodic benefit cost (credit) | 1 | (1) | 1 | (1)
Regulatory adjustments | (1) | 1 | (1) | 1
Total expense (income) recognized | 0 | 0 | 0 | 0
PBOP | Southern California Gas Company |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 2 | 3 | 7 | 13
Interest cost | 7 | 5 | 21 | 16
Expected return on assets | (14) | (13) | (44) | (40)
Amortization of: |  |  |  |
Prior service cost (credit) | (1) | (1) | (2) | (2)
Actuarial loss (gain) | (5) | (3) | (15) | (9)
Net periodic benefit cost (credit) | (11) | (9) | (33) | (22)
Regulatory adjustments | 11 | 9 | 33 | 22
Total expense (income) recognized | $ 0 | $ 0 | $ 0 | $ 0

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