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GENERAL INFORMATION AND OTHER FINANCIAL DATA - AFFILIATES REVENUE AND COST OF SALES (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Related Party Transaction [Line Items] |  |  |  |
Revenues | $ 3,334 | $ 3,617 | $ 13,229 | $ 10,984
Interest income | 19 | 18 | 60 | 58
Interest expense | 312 | 282 | 995 | 796
Related Party |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Revenues | 10 | 10 | 34 | 32
Interest income | 0 | 2 | 0 | 16
Interest expense | 3 | 4 | 11 | 12
San Diego Gas and Electric Company |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Interest income | 7 | 2 | 12 | 3
Interest expense | 126 | 113 | 367 | 333
Operating revenues | 1,442 | 1,569 | 4,357 | 4,413
San Diego Gas and Electric Company | Related Party |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Operating revenues | 5 | 4 | 15 | 12
Cost of sales | 25 | 17 | 82 | 67
Southern California Gas Company |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Interest income | 2 | 3 | 7 | 4
Interest expense | 70 | 50 | 210 | 135
Operating revenues | 1,313 | 1,385 | 6,574 | 4,879
Southern California Gas Company | Related Party |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Operating revenues | 29 | 24 | 91 | 73
Cost of sales | $ 2 | $ (1) | $ 37 | $ (5)

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