SAN ONOFRE NUCLEAR GENERATING STATION - ASSET RETIREMENT OBLIGATION AND SPENT NUCLEAR FUEL (Details) - San Diego Gas and Electric Company [Member] $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($)
Jointly Owned Utility Plant Interests [Line Items]
Decommissioning liability	$ 568
2022	79
2023	66
2024	77
2025	46
2026	52
Thereafter	$ 718

Decommissioning Costs, Undiscounted Future Payments, After Year Five

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Decommissioning Costs, Undiscounted Future Payments, Next Twelve Months

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- Definition

Decommissioning Costs, Undiscounted Future Payments, Year Five

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Decommissioning Costs, Undiscounted Future Payments, Year Four

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Decommissioning Costs, Undiscounted Future Payments, Year Three

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Decommissioning Costs, Undiscounted Future Payments, Year Two

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- Definition

Decommissioning Liability

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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