Compensation and Benefit Plans (Plan Assets and Benefit Obligation) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Amounts recognized in the consolidated balance sheets consist of:
Long-term liabilities	$ (869)	$ (943)
SCE
Amounts recognized in the consolidated balance sheets consist of:
Long-term liabilities	(433)	(483)
Pension Plans
Change in projected benefit obligation
Projected benefit obligation at beginning of year	4,179	4,284
Service cost	126	137
Interest cost	141	164
Actuarial (gain) loss	(280)	(46)
Benefits paid	(286)	(360)
Projected benefit obligation at end of year	3,880	4,179	$ 4,284
Change in plan assets
Fair value of plan assets at beginning of year	3,616	3,388
Actual return on plan assets	(86)	483
Employer contributions	77	105
Benefits paid	(286)	(360)
Fair value of plan assets at end of year	3,321	3,616	3,388
Funded status at end of year	(559)	(563)
Amounts recognized in the consolidated balance sheets consist of:
Long-term assets	2	7
Current liabilities	(29)	(17)
Long-term liabilities	(532)	(553)
Amounts recognized in the consolidated balance sheets	(559)	(563)
Amounts recognized in accumulated other comprehensive loss consist of:
Prior service cost	(1)	(1)
Net loss	83	77
Total amounts recognized in accumulated other comprehensive loss	(82)	(76)
Amounts recognized as a regulatory liability	271	271
Total not yet recognized as income	353	347
Accumulated benefit obligation at end of year	3,753	4,022
Pension plans with an accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	3,880	4,179
Accumulated benefit obligation	3,753	4,022
Fair value of plan assets	$ 3,321	$ 3,616
Weighted-average assumptions used to determine obligations at end of year:
Discount rate	4.19%	3.46%
Rate of compensation increase	4.10%	4.10%
Pension Plans \| Edison International
Assumed health care cost trend rates:
Long-term payable	$ 117	$ 114
Pension Plans \| SCE
Change in projected benefit obligation
Projected benefit obligation at beginning of year	3,702	3,791
Service cost	121	129
Interest cost	124	144
Actuarial (gain) loss	(273)	(74)
Benefits paid	(243)	(288)
Projected benefit obligation at end of year	3,431	3,702	3,791
Change in plan assets
Fair value of plan assets at beginning of year	3,390	3,172
Actual return on plan assets	(86)	442
Employer contributions	52	64
Benefits paid	(232)	(288)
Fair value of plan assets at end of year	3,124	3,390	3,172
Funded status at end of year	(307)	(312)
Amounts recognized in the consolidated balance sheets consist of:
Long-term assets	0	0
Current liabilities	(5)	(4)
Long-term liabilities	(302)	(308)
Amounts recognized in the consolidated balance sheets	(307)	(312)
Amounts recognized in accumulated other comprehensive loss consist of:
Prior service cost	0	0
Net loss	17	21
Total amounts recognized in accumulated other comprehensive loss	(17)	(21)
Amounts recognized as a regulatory liability	271	271
Total not yet recognized as income	288	292
Accumulated benefit obligation at end of year	3,342	3,585
Pension plans with an accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	3,431	3,702
Accumulated benefit obligation	3,342	3,585
Fair value of plan assets	$ 3,124	$ 3,390
Weighted-average assumptions used to determine obligations at end of year:
Discount rate	4.19%	3.46%
Rate of compensation increase	4.10%	4.10%
Assumed health care cost trend rates:
Net loss reclassified from other comprehensive loss	$ 21	$ 19
Postretirement Benefits Other Than Pensions
Change in projected benefit obligation
Projected benefit obligation at beginning of year	2,337	2,276
Service cost	37	31	35
Interest cost	80	86	97
Special termination benefits	0	1
Actuarial (gain) loss	(382)	24
Plan participants' contributions	28	24
Benefits paid	(114)	(105)
Projected benefit obligation at end of year	1,986	2,337	2,276
Change in plan assets
Fair value of plan assets at beginning of year	2,330	2,102
Actual return on plan assets	(123)	297
Employer contributions	13	12
Plan participants' contributions	28	24
Benefits paid	(115)	(105)
Fair value of plan assets at end of year	2,133	2,330	2,102
Funded status at end of year	147	(7)
Amounts recognized in the consolidated balance sheets consist of:
Long-term assets	159	6
Current liabilities	(12)	(13)
Long-term liabilities	0	0
Amounts recognized in the consolidated balance sheets	147	(7)
Amounts recognized in accumulated other comprehensive loss consist of:
Total amounts recognized in accumulated other comprehensive loss	(1)	(4)
Amounts recognized as a regulatory liability	(185)	(26)
Total not yet recognized as income	$ (184)	$ (22)
Weighted-average assumptions used to determine obligations at end of year:
Discount rate	4.35%	3.70%
Assumed health care cost trend rates:
Rate assumed for following year	6.75%	6.75%
Ultimate rate	5.00%	5.00%
Gain from increase in discount rate	$ (195)
Experience gain	(137)
Postretirement Benefits Other Than Pensions \| SCE
Change in projected benefit obligation
Projected benefit obligation at beginning of year	2,325	$ 2,266
Service cost	37	31	34
Interest cost	80	85	97
Special termination benefits	0	1
Actuarial (gain) loss	(379)	23
Plan participants' contributions	28	24
Benefits paid	(114)	(105)
Projected benefit obligation at end of year	1,977	2,325	2,266
Change in plan assets
Fair value of plan assets at beginning of year	2,330	2,102
Actual return on plan assets	(123)	297
Employer contributions	12	12
Plan participants' contributions	28	24
Benefits paid	(114)	(105)
Fair value of plan assets at end of year	2,133	2,330	$ 2,102
Funded status at end of year	156	5
Amounts recognized in the consolidated balance sheets consist of:
Long-term assets	168	17
Current liabilities	(12)	(12)
Long-term liabilities	0	0
Amounts recognized in the consolidated balance sheets	156	5
Amounts recognized in accumulated other comprehensive loss consist of:
Total amounts recognized in accumulated other comprehensive loss	0	0
Amounts recognized as a regulatory liability	(185)	(26)
Total not yet recognized as income	$ (185)	$ (26)
Weighted-average assumptions used to determine obligations at end of year:
Discount rate	4.35%	3.70%
Assumed health care cost trend rates:
Rate assumed for following year	6.75%	6.75%
Ultimate rate	5.00%	5.00%
Gain from increase in discount rate	$ (194)
Experience gain	$ 135

Defined Benefit Plan, Actuarial Gain (Loss), Experience Gain (Loss)

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Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss), Discount Rate Change

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Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit).

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Amount, after tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses.

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Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

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Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans.

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Amount of asset, recognized in statement of financial position, for overfunded defined benefit pension and other postretirement plans.

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Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan.

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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Amount of contributions received by defined benefit plan from participant which increase benefit obligation.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status.

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

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Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets.

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