Compensation and Benefit Plans (Plan Assets and Obligation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Amounts recognized in the consolidated balance sheets consist of:
Long-term liabilities	$ (422)	$ (496)
SCE
Amounts recognized in the consolidated balance sheets consist of:
Long-term liabilities	(105)	(111)
Pension Plans
Change in projected benefit obligation
Projected benefit obligation at beginning of year	4,171	4,476
Service cost	120	130	$ 121
Interest cost	111	103	124
Actuarial (gain) loss	(589)	(245)
Benefits paid	(289)	(293)
Projected benefit obligation at end of year	3,524	4,171	4,476
Change in plan assets
Fair value of plan assets at beginning of year	4,296	4,171
Actual return on plan assets	(575)	368
Employer contributions	30	50
Benefits paid	(289)	(293)
Fair value of plan assets at end of year	3,462	4,296	$ 4,171
Funded status at end of year	(62)	125
Amounts recognized in the consolidated balance sheets consist of:
Long-term assets	139	384
Current liabilities	(26)	(26)
Long-term liabilities	(175)	(233)
Amounts recognized in the consolidated balance sheets	(62)	125
Amounts recognized in accumulated other comprehensive loss consist of:
Net loss	17	74
Amounts recognized as a regulatory (liability)/asset	(139)	(395)
Accumulated benefit obligation at end of year	3,401	3,947
Pension plans with an accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	3,524	4,171
Accumulated benefit obligation	3,401	3,947
Fair value of plan assets	$ 3,462	$ 4,296
Weighted average assumptions used to determine obligations at end of year:
Discount rate	5.36%	2.75%	2.38%
Rate of compensation increase	4.00%	4.00%
Assumed health care cost trend rates:
Long-term payable	$ 93	$ 132
Gain (loss) from change in discount rate	1,000	159
Gain (loss) from valuation and experience	456	69
Pension Plans | SCE
Pension and Other Postretirement Benefits
Expected contributions	8
Change in projected benefit obligation
Projected benefit obligation at beginning of year	3,694	3,984
Service cost	118	127	$ 119
Service cost, excluding certain liabilities	115	126
Interest cost	101	95	114
Interest cost, excluding certain liabilities	97	92
Actuarial (gain) loss	(503)	(246)
Benefits paid	(244)	(262)
Projected benefit obligation at end of year	3,159	3,694	3,984
Change in plan assets
Fair value of plan assets at beginning of year	4,061	3,940
Actual return on plan assets	(544)	348
Employer contributions	2	35
Benefits paid	(244)	(262)
Fair value of plan assets at end of year	3,275	4,061	$ 3,940
Funded status at end of year	116	367
Amounts recognized in the consolidated balance sheets consist of:
Long-term assets	128	384
Current liabilities	(2)	(2)
Long-term liabilities	(10)	(15)
Amounts recognized in the consolidated balance sheets	116	367
Amounts recognized in accumulated other comprehensive loss consist of:
Net loss	8	12
Amounts recognized as a regulatory (liability)/asset	(139)	(395)
Accumulated benefit obligation at end of year	3,049	3,491
Pension plans with an accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	3,159	3,694
Accumulated benefit obligation	3,049	3,491
Fair value of plan assets	$ 3,275	$ 4,061
Weighted average assumptions used to determine obligations at end of year:
Discount rate	5.36%	2.75%
Rate of compensation increase	4.00%	4.00%
Assumed health care cost trend rates:
Ultimate rate	4.50%	4.50%	5.00%
Net loss reclassified from other comprehensive loss	$ 3	$ 32
Gain (loss) from change in discount rate	929	149
Gain (loss) from valuation and experience	430	83
Pension Plans | Edison International Parent and Other
Pension and Other Postretirement Benefits
Expected contributions	35
Postretirement Benefits Other Than Pensions
Pension and Other Postretirement Benefits
Expected contributions	8
Change in projected benefit obligation
Projected benefit obligation at beginning of year	1,904	2,073
Service cost	34	40	$ 38
Interest cost	56	52	63
Actuarial (gain) loss	(598)	(190)
Plan participants' contributions	29	29
Benefits paid	(94)	(100)
Projected benefit obligation at end of year	1,331	1,904	2,073
Change in plan assets
Fair value of plan assets at beginning of year	2,772	2,717
Actual return on plan assets	(527)	119
Employer contributions	7	7
Plan participants' contributions	29	29
Benefits paid	(94)	(100)
Fair value of plan assets at end of year	2,187	2,772	$ 2,717
Funded status at end of year	856	868
Amounts recognized in the consolidated balance sheets consist of:
Long-term assets	871	885
Current liabilities	(8)	(8)
Long-term liabilities	(7)	(9)
Amounts recognized in the consolidated balance sheets	856	868
Amounts recognized in accumulated other comprehensive loss consist of:
Net loss	(2)	1
Amounts recognized as a regulatory (liability)/asset	$ (867)	$ (886)
Weighted average assumptions used to determine obligations at end of year:
Discount rate	5.43%	2.95%	2.67%
Assumed health care cost trend rates:
Rate assumed for following year	6.75%	6.25%
Ultimate rate	5.00%	5.00%	5.00%
Gain (loss) from change in discount rate	$ 546	$ 83
Gain (loss) from valuation and experience		113
Postretirement Benefits Other Than Pensions | SCE
Change in projected benefit obligation
Projected benefit obligation at beginning of year	1,895	2,064
Service cost	34	40	$ 37
Interest cost	55	52	63
Actuarial (gain) loss	(596)	(190)
Plan participants' contributions	29	29
Benefits paid	(94)	(100)
Projected benefit obligation at end of year	1,323	1,895	2,064
Change in plan assets
Fair value of plan assets at beginning of year	2,772	2,717
Actual return on plan assets	(527)	119
Employer contributions	7	7
Plan participants' contributions	29	29
Benefits paid	(94)	(100)
Fair value of plan assets at end of year	2,187	2,772	$ 2,717
Funded status at end of year	864	877
Amounts recognized in the consolidated balance sheets consist of:
Long-term assets	871	885
Current liabilities	(7)	(8)
Amounts recognized in the consolidated balance sheets	864	877
Amounts recognized in accumulated other comprehensive loss consist of:
Amounts recognized as a regulatory (liability)/asset	$ (867)	$ (886)
Weighted average assumptions used to determine obligations at end of year:
Discount rate	5.43%	2.95%
Assumed health care cost trend rates:
Rate assumed for following year	6.75%	6.25%
Ultimate rate	5.00%	5.00%
Gain (loss) from change in discount rate	$ 543