SEMPRA - CONTINGENTLY REDEEMABLE NONCONTROLLING INTEREST (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Sep. 30, 2025
Redeemable Noncontrolling Interest [Line Items]
Allocation of interests	$ 42
Increase (decrease) in allocation of interests	(42)
NCI
Redeemable Noncontrolling Interest [Line Items]
Increase (decrease) in allocation of interests	(48)
Sempra shareholders' equity
Redeemable Noncontrolling Interest [Line Items]
Increase (decrease) in allocation of interests	$ 6
SI Partners \| PA2 JVCo
Redeemable Noncontrolling Interest [Line Items]
Equity interests issued		49.90%

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.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 480
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479857/480-10-S50-3

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 480
-SubTopic 10
-Name Accounting Standards Codification
-Section S45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479887/480-10-S45-3

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 480
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3A
-Subparagraph (24)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480244/480-10-S99-3A

Name:	us-gaap_RedeemableNoncontrollingInterestLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration