FAIR VALUE MEASUREMENTS - FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable, allowance for credit losses	$ 4	$ 4
Notes receivable, unamortized transaction costs	2	3
Unamortized discount and debt issuance costs	328	305
Finance lease obligations	1,251	1,293
Long-term debt held for sale, unamortized discount and debt issuance costs	127	132
Long-term debt held for sale, finance lease obligation	35
Carrying amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term amounts due from unconsolidated affiliates	30
Long-term note receivable	383	369
Long-term amounts due to unconsolidated affiliates held for sale	574	477
Long-term debt held for sale	9,768	7,925
Long-term debt	32,113	29,867
Fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term amounts due from unconsolidated affiliates	30
Long-term note receivable	368	366
Long-term amounts due to unconsolidated affiliates held for sale	551	463
Long-term debt held for sale	9,281	7,611
Long-term debt	28,484	28,282
Fair value \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term amounts due from unconsolidated affiliates	0
Long-term note receivable	0	0
Long-term amounts due to unconsolidated affiliates held for sale	0	0
Long-term debt held for sale	0	0
Long-term debt	0	0
Fair value \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term amounts due from unconsolidated affiliates	0
Long-term note receivable	0	0
Long-term amounts due to unconsolidated affiliates held for sale	551	463
Long-term debt held for sale	9,281	7,611
Long-term debt	28,484	28,282
Fair value \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term amounts due from unconsolidated affiliates	30
Long-term note receivable	368	366
Long-term amounts due to unconsolidated affiliates held for sale	0	0
Long-term debt held for sale	0	0
Long-term debt	0	0
San Diego Gas and Electric Company
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unamortized discount and debt issuance costs	106	97
Finance lease obligations	1,149	1,176
San Diego Gas and Electric Company \| Carrying amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	10,150	9,800
San Diego Gas and Electric Company \| Fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	8,426	8,810
San Diego Gas and Electric Company \| Fair value \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	0	0
San Diego Gas and Electric Company \| Fair value \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	8,426	8,810
San Diego Gas and Electric Company \| Fair value \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	0	0
Southern California Gas Company
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unamortized discount and debt issuance costs	90	78
Finance lease obligations	102	117
Southern California Gas Company \| Carrying amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	8,755	8,109
Southern California Gas Company \| Fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	7,790	7,818
Southern California Gas Company \| Fair value \| Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	0	0
Southern California Gas Company \| Fair value \| Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	7,790	7,818
Southern California Gas Company \| Fair value \| Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 0	$ 0

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Notes Receivable, Noncurrent, Allowance For Credit Loss

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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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Present value of lessee's discounted obligation for lease payments from finance lease.

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