Fair Value Measurements - Fair Value of Debt Recorded at Carrying Value (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Fair Value of Long-Term Debt Recorded at Carrying Value
Carrying Value	$ 38,386	$ 35,583
Fair Value	35,460	33,160
SCE
Fair Value of Long-Term Debt Recorded at Carrying Value
Carrying Value	32,777	30,515
Fair Value	$ 29,863	$ 27,994

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant