Compensation and Benefit Plans (Plan Assets and Obligation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Amounts recognized in the consolidated balance sheets consist of:
Long-term liabilities	$ (415)	$ (422)
Assumed health care cost trend rates:
Other deferred credits and other long-term liabilities	3,258	2,988
Pension Plans
Pension and Other Postretirement Benefits
Expected contributions	45	13
Change in projected benefit obligation
Projected benefit obligation at beginning of year	3,524	4,171
Service cost	101	120	$ 130
Interest cost	180	111	103
Actuarial (gain) loss	96	(589)
Benefits paid	(254)	(289)
Projected benefit obligation at end of year	3,647	3,524	4,171
Change in plan assets
Fair value of plan assets at beginning of year	3,462	4,296
Actual return on plan assets	369	(575)
Employer contributions	32	30
Benefits paid	(254)	(289)
Fair value of plan assets at end of year	3,609	3,462	$ 4,296
(Underfunded)/Overfunded status at end of year	(38)	(62)
Amounts recognized in the consolidated balance sheets consist of:
Long-term assets	169	139
Current liabilities	(30)	(26)
Long-term liabilities	(177)	(175)
Amounts recognized in the consolidated balance sheets	(38)	(62)
Amounts recognized in accumulated other comprehensive loss consist of:
Net gain	21	17
Amounts recognized as a regulatory (liability)/asset	(159)	(139)
Accumulated benefit obligation at end of year	3,495	3,401
Pension plans with an accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	3,647	3,524
Accumulated benefit obligation	3,495	3,401
Fair value of plan assets	$ 3,609	$ 3,462
Weighted average assumptions used to determine obligations at end of year:
Discount rate	5.04%	5.36%	2.75%
Rate of compensation increase	4.00%	4.00%
Assumed health care cost trend rates:
Ultimate rate	5.86%	4.50%	4.50%
Gain (loss) from change in discount rate	$ (96)	$ 1,000
Basis points in the discount rate	0.32
Gain (loss) from valuation and experience		(456)
Postretirement Benefits Other Than Pensions
Pension and Other Postretirement Benefits
Expected contributions	$ 0
Change in projected benefit obligation
Projected benefit obligation at beginning of year	1,331	1,904
Service cost	20	34	$ 40
Interest cost	67	56	52
Actuarial (gain) loss	(567)	(598)
Plan participants' contributions	28	29
Benefits paid	(106)	(94)
Projected benefit obligation at end of year	773	1,331	1,904
Change in plan assets
Fair value of plan assets at beginning of year	2,187	2,772
Actual return on plan assets	162	(527)
Employer contributions	4	7
Plan participants' contributions	28	29
Benefits paid	(106)	(94)
Fair value of plan assets at end of year	2,275	2,187	$ 2,772
(Underfunded)/Overfunded status at end of year	1,502	856
Amounts recognized in the consolidated balance sheets consist of:
Long-term assets	1,506	871
Current liabilities		(8)
Long-term liabilities	(4)	(7)
Amounts recognized in the consolidated balance sheets	1,502	856
Amounts recognized in accumulated other comprehensive loss consist of:
Net gain	(5)	(2)
Amounts recognized as a regulatory (liability)/asset	$ (1,505)	$ (867)
Weighted average assumptions used to determine obligations at end of year:
Discount rate	5.06%	5.43%	2.95%
Assumed health care cost trend rates:
Rate assumed for following year	6.50%	6.75%
Ultimate rate	5.00%	5.00%	5.00%
Gain (loss) from change in discount rate	$ 553	$ 546
SCE
Amounts recognized in the consolidated balance sheets consist of:
Long-term liabilities	(105)	(105)
Assumed health care cost trend rates:
Other deferred credits and other long-term liabilities	3,206	2,919
SCE | Pension Plans
Change in projected benefit obligation
Projected benefit obligation at beginning of year	3,159	3,694
Service cost	99	118	$ 127
Service cost, excluding certain liabilities	97	115
Interest cost	166	101	95
Interest cost, excluding certain liabilities	162	97
Actuarial (gain) loss	82	(503)
Benefits paid	(222)	(244)
Projected benefit obligation at end of year	3,278	3,159	3,694
Change in plan assets
Fair value of plan assets at beginning of year	3,275	4,061
Actual return on plan assets	349	(544)
Employer contributions	13	2
Benefits paid	(222)	(244)
Fair value of plan assets at end of year	3,415	3,275	4,061
(Underfunded)/Overfunded status at end of year	137	116
Amounts recognized in the consolidated balance sheets consist of:
Long-term assets	149	128
Current liabilities	(2)	(2)
Long-term liabilities	(10)	(10)
Amounts recognized in the consolidated balance sheets	137	116
Amounts recognized in accumulated other comprehensive loss consist of:
Net gain	8	8
Amounts recognized as a regulatory (liability)/asset	(159)	(139)
Accumulated benefit obligation at end of year	3,136	3,049
Pension plans with an accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	3,278	3,159
Accumulated benefit obligation	3,136	3,049
Fair value of plan assets	$ 3,415	$ 3,275
Weighted average assumptions used to determine obligations at end of year:
Discount rate	5.04%	5.36%
Rate of compensation increase	4.00%	4.00%
Assumed health care cost trend rates:
Gain (loss) from change in discount rate	$ (92)	$ 929
Gain (loss) from valuation and experience		(430)
SCE | Pension Plans | Edison International
Amounts recognized in accumulated other comprehensive loss consist of:
Net gain	8	3
Assumed health care cost trend rates:
Other deferred credits and other long-term liabilities	94	93
SCE | Postretirement Benefits Other Than Pensions
Change in projected benefit obligation
Projected benefit obligation at beginning of year	1,323	1,895
Service cost	20	34	40
Interest cost	67	55	52
Actuarial (gain) loss	(563)	(596)
Plan participants' contributions	28	29
Benefits paid	(106)	(94)
Projected benefit obligation at end of year	769	1,323	1,895
Change in plan assets
Fair value of plan assets at beginning of year	2,187	2,772
Actual return on plan assets	162	(527)
Employer contributions	4	7
Plan participants' contributions	28	29
Benefits paid	(106)	(94)
Fair value of plan assets at end of year	2,275	2,187	$ 2,772
(Underfunded)/Overfunded status at end of year	1,506	864
Amounts recognized in the consolidated balance sheets consist of:
Long-term assets	1,506	871
Current liabilities		(7)
Amounts recognized in the consolidated balance sheets	1,506	864
Amounts recognized in accumulated other comprehensive loss consist of:
Amounts recognized as a regulatory (liability)/asset	$ (1,505)	$ (867)
Weighted average assumptions used to determine obligations at end of year:
Discount rate	5.06%	5.43%
Assumed health care cost trend rates:
Rate assumed for following year	6.50%	6.75%
Ultimate rate	5.00%	5.00%
Gain (loss) from change in discount rate	$ 550	$ 543