Compensation and Benefit Plans - Information on Pension Plan Assets and Benefit Obligations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Amounts recognized in the consolidated balance sheets consist of:
Long-term liabilities	$ (384)	$ (415)
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Other deferred credits and other long-term liabilities	3,566	3,258
Pension Plan
Change in projected benefit obligation
Projected benefit obligation at beginning of year	3,647	3,524
Service cost	103	101	$ 120
Interest cost	175	180	111
Actuarial (gain) loss	(59)	96
Benefits paid	(230)	(254)
Projected benefit obligation at end of year	3,636	3,647	3,524
Change in plan assets
Fair value of plan assets at beginning of year	3,609	3,462
Actual return on plan assets	192	369
Employer contributions	37	32
Benefits paid	(230)	(254)
Fair value of plan assets at end of year	3,608	3,609	$ 3,462
(Underfunded)/Overfunded status at end of year	(28)	(38)
Amounts recognized in the consolidated balance sheets consist of:
Long-term assets	166	169
Current liabilities	(27)	(30)
Long-term liabilities	(167)	(177)
Amounts recognized in the consolidated balance sheets	(28)	(38)
Amounts recognized in accumulated other comprehensive loss consist of:
Net gain (loss)	8	21
Amounts recognized as a regulatory liability	(146)	(159)
Accumulated benefit obligation at end of year	3,508	3,495
Pension plans with plan assets in excess of an accumulated benefit obligation:
Projected benefit obligation	3,636	3,647
Accumulated benefit obligation	3,508	3,495
Fair value of plan assets	$ 3,608	$ 3,609
Weighted average assumptions used to determine obligations at end of year:
Discount rate	5.56%	5.04%
Rate of compensation increase	4.00%	4.00%
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Ultimate rate	5.54%	5.86%	4.50%
Other Postretirement Benefits Plan
Change in projected benefit obligation
Projected benefit obligation at beginning of year	$ 773	$ 1,331
Service cost	14	20	$ 34
Interest cost	38	67	56
Change in plan provisions	23	0
Actuarial (gain) loss	(34)	(567)
Plan participants' contributions	26	28
Benefits paid	(99)	(106)
Projected benefit obligation at end of year	741	773	1,331
Change in plan assets
Fair value of plan assets at beginning of year	2,275	2,187
Actual return on plan assets	78	162
Employer contributions	1	4
Plan participants' contributions	26	28
Benefits paid	(99)	(106)
Fair value of plan assets at end of year	2,281	2,275	$ 2,187
(Underfunded)/Overfunded status at end of year	1,540	1,502
Amounts recognized in the consolidated balance sheets consist of:
Long-term assets	1,544	1,506
Current liabilities	(1)	0
Long-term liabilities	(3)	(4)
Amounts recognized in the consolidated balance sheets	1,540	1,502
Amounts recognized in accumulated other comprehensive loss consist of:
Net gain (loss)	(4)	(5)
Amounts recognized as a regulatory liability	$ (1,544)	$ (1,505)
Weighted average assumptions used to determine obligations at end of year:
Discount rate	5.60%	5.06%
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Rate assumed for following year	6.25%	6.50%
Ultimate rate	5.00%	5.00%	5.00%
SCE
Amounts recognized in the consolidated balance sheets consist of:
Long-term liabilities	$ (92)	$ (105)
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Other deferred credits and other long-term liabilities	3,518	3,206
SCE | Pension Plan
Change in projected benefit obligation
Projected benefit obligation at beginning of year	3,278	3,159
Service cost	101	99	$ 118
Service cost, excluding certain liabilities	99	97
Interest cost	162	166	101
Interest cost, excluding certain liabilities	157	162
Actuarial (gain) loss	(47)	82
Benefits paid	(198)	(222)
Projected benefit obligation at end of year	3,289	3,278	3,159
Change in plan assets
Fair value of plan assets at beginning of year	3,415	3,275
Actual return on plan assets	182	349
Employer contributions	17	13
Benefits paid	(198)	(222)
Fair value of plan assets at end of year	3,416	3,415	$ 3,275
(Underfunded)/Overfunded status at end of year	127	137
Amounts recognized in the consolidated balance sheets consist of:
Long-term assets	137	149
Current liabilities	(1)	(2)
Long-term liabilities	(9)	(10)
Amounts recognized in the consolidated balance sheets	127	137
Amounts recognized in accumulated other comprehensive loss consist of:
Net gain (loss)	13	8
Amounts recognized as a regulatory liability	(133)	(159)
Accumulated benefit obligation at end of year	3,172	3,136
Pension plans with plan assets in excess of an accumulated benefit obligation:
Projected benefit obligation	3,289	3,278
Accumulated benefit obligation	3,172	3,136
Fair value of plan assets	$ 3,416	$ 3,415
Weighted average assumptions used to determine obligations at end of year:
Discount rate	5.56%	5.04%	5.36%
Rate of compensation increase	4.00%	4.00%
SCE | Pension Plan | Parent Company
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Other deferred credits and other long-term liabilities	$ 88	$ 94
SCE | Other Postretirement Benefits Plan
Change in projected benefit obligation
Projected benefit obligation at beginning of year	769	1,323
Service cost	14	20	$ 34
Interest cost	38	67	55
Change in plan provisions	23	0
Actuarial (gain) loss	(34)	(563)
Plan participants' contributions	26	28
Benefits paid	(99)	(106)
Projected benefit obligation at end of year	737	769	1,323
Change in plan assets
Fair value of plan assets at beginning of year	2,275	2,187
Actual return on plan assets	78	162
Employer contributions	1	4
Plan participants' contributions	26	28
Benefits paid	(99)	(106)
Fair value of plan assets at end of year	2,281	2,275	$ 2,187
(Underfunded)/Overfunded status at end of year	1,544	1,506
Amounts recognized in the consolidated balance sheets consist of:
Long-term assets	1,544	1,506
Current liabilities	0	0
Long-term liabilities	0	0
Amounts recognized in the consolidated balance sheets	1,544	1,506
Amounts recognized in accumulated other comprehensive loss consist of:
Net gain (loss)	0	0
Amounts recognized as a regulatory liability	$ (1,544)	$ (1,505)
Weighted average assumptions used to determine obligations at end of year:
Discount rate	5.60%	5.06%
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Rate assumed for following year	6.25%	6.50%
Ultimate rate	5.00%	5.00%