Variable Interest Entities (Trusts) (Details) - USD ($)	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Variable Interest Entities
Preferred / preference stock outstanding value	$ 1,645,000,000			$ 1,645,000,000		$ 1,673,000,000
SCE
Variable Interest Entities
Preferred / preference stock outstanding value	2,495,000,000			2,495,000,000		2,495,000,000
Common stock	$ 2,168,000,000			$ 2,168,000,000		2,168,000,000
SCE | Trust securities
Variable Interest Entities
Liquidation value (in dollars per share)	$ 2,500			$ 2,500
SCE | 6.95% Series N Preference Stock
Variable Interest Entities
Security dividend rate (as a percent)		6.95%
Liquidation value (in dollars per share)		$ 2,500
Preferred / preference stock outstanding value		$ 350,000,000
SCE | Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entities
Liquidation value (in dollars per share)	$ 25			$ 25
Common stock	$ 10,000			$ 10,000		10,000
SCE | Power Purchase Agreement
Variable Interest Entities
Amounts paid to VIEs	246,000,000		$ 191,000,000	592,000,000	$ 476,000,000
SCE | Trust II
Variable Interest Entities
Security dividend rate (as a percent)											5.10%
Liquidation preference											$ 400,000,000
Investments	220,000,000			220,000,000		220,000,000
Preferred / preference stock outstanding value	220,000,000			220,000,000		220,000,000
SCE | Trust II | Trust securities
Variable Interest Entities
Liquidation preference											$ 400,000,000
SCE | Trust III
Variable Interest Entities
Security dividend rate (as a percent)										5.75%
Liquidation preference										$ 275,000,000
Investments	275,000,000			275,000,000		275,000,000
Preferred / preference stock outstanding value	275,000,000			275,000,000		275,000,000
SCE | Trust III | Trust securities
Variable Interest Entities
Liquidation preference										$ 275,000,000
SCE | Trust IV
Variable Interest Entities
Security dividend rate (as a percent)									5.375%
Liquidation preference									$ 325,000,000
Investments	325,000,000			325,000,000		325,000,000
Preferred / preference stock outstanding value	325,000,000			325,000,000		325,000,000
SCE | Trust IV | Trust securities
Variable Interest Entities
Liquidation preference									$ 325,000,000
SCE | Trust V
Variable Interest Entities
Security dividend rate (as a percent)								5.45%
Liquidation preference								$ 300,000,000
Investments	300,000,000			300,000,000		300,000,000
Preferred / preference stock outstanding value	300,000,000			300,000,000		300,000,000
SCE | Trust V | Trust securities
Variable Interest Entities
Liquidation preference								$ 300,000,000
SCE | Trust VI
Variable Interest Entities
Security dividend rate (as a percent)							5.00%
Liquidation preference							$ 475,000,000
Investments	475,000,000			475,000,000		475,000,000
Preferred / preference stock outstanding value	475,000,000			475,000,000		$ 475,000,000
SCE | Trust VI | Trust securities
Variable Interest Entities
Liquidation preference							$ 475,000,000
SCE | Trust VII
Variable Interest Entities
Security dividend rate (as a percent)						7.50%
Liquidation preference						$ 550,000,000
Investments	550,000,000			550,000,000
Preferred / preference stock outstanding value	550,000,000			$ 550,000,000		550,000,000
SCE | Trust VII | Trust securities
Variable Interest Entities
Liquidation preference						$ 550,000,000
SCE | Trust VIII
Variable Interest Entities
Security dividend rate (as a percent)				6.95%
Liquidation preference	350,000,000			$ 350,000,000
Investments	350,000,000			350,000,000
Preferred / preference stock outstanding value	350,000,000			350,000,000
Common stock	10,000			10,000
SCE | Trust VIII | Trust securities
Variable Interest Entities
Liquidation preference	$ 350,000,000			$ 350,000,000