Compensation and Benefit Plans (Plan Assets and Obligation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Amounts recognized in the consolidated balance sheets consist of:
Long-term liabilities	$ (496)	$ (563)
SCE
Amounts recognized in the consolidated balance sheets consist of:
Long-term liabilities	(111)	(144)
Pension Plans
Pension and Other Postretirement Benefits
Expected contributions	27
Change in projected benefit obligation
Projected benefit obligation at beginning of year	4,476	4,139
Service cost	130	121	$ 114
Interest cost	103	124	155
Actuarial (gain) loss	(245)	323
Benefits paid	(293)	(231)
Projected benefit obligation at end of year	4,171	4,476	4,139
Change in plan assets
Fair value of plan assets at beginning of year	4,171	3,755
Actual return on plan assets	368	584
Employer contributions	50	62
Benefits paid	(293)	(230)
Fair value of plan assets at end of year	4,296	4,171	$ 3,755
Funded status at end of year	125	(305)
Amounts recognized in the consolidated balance sheets consist of:
Long-term assets	384
Current liabilities	(26)	(24)
Long-term liabilities	(233)	(281)
Amounts recognized in the consolidated balance sheets	125	(305)
Amounts recognized in accumulated other comprehensive loss consist of:
Prior service cost		(1)
Net loss	74	96
Total amounts recognized in accumulated other comprehensive loss	74	95
Amounts recognized as a regulatory (liability)/asset	(395)	12
Total not yet recognized as income	(321)	107
Accumulated benefit obligation at end of year	3,947	4,238
Pension plans with an accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	4,171	4,476
Accumulated benefit obligation	3,947	4,238
Fair value of plan assets	$ 4,296	$ 4,171
Weighted average assumptions used to determine obligations at end of year:
Discount rate	2.75%	2.38%	3.11%
Rate of compensation increase	4.00%	4.00%
Assumed health care cost trend rates:
Long-term payable	$ 132	$ 139
Gain (loss) from change in discount rate	159	(339)
Gain (loss) from demographic change		(76)
Gain (loss) from valuation and experience	69	(48)
Gains (losses) from other economic assumption changes		117
Pension Plans | SCE
Pension and Other Postretirement Benefits
Expected contributions	2
Change in projected benefit obligation
Projected benefit obligation at beginning of year	3,984	3,662
Service cost	127	119	$ 111
Service cost, excluding certain liabilities	126	117
Interest cost	95	114	143
Interest cost, excluding certain liabilities	92	110
Actuarial (gain) loss	(246)	292
Benefits paid	(262)	(197)
Projected benefit obligation at end of year	3,694	3,984	3,662
Change in plan assets
Fair value of plan assets at beginning of year	3,940	3,541
Actual return on plan assets	348	551
Employer contributions	35	45
Benefits paid	(262)	(197)
Fair value of plan assets at end of year	4,061	3,940	$ 3,541
Funded status at end of year	367	(44)
Amounts recognized in the consolidated balance sheets consist of:
Long-term assets	384
Current liabilities	(2)	(2)
Long-term liabilities	(15)	(42)
Amounts recognized in the consolidated balance sheets	367	(44)
Amounts recognized in accumulated other comprehensive loss consist of:
Net loss	12	16
Total amounts recognized in accumulated other comprehensive loss	12	16
Amounts recognized as a regulatory (liability)/asset	(395)	12
Total not yet recognized as income	(383)	28
Accumulated benefit obligation at end of year	3,491	3,776
Pension plans with an accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	3,694	3,984
Accumulated benefit obligation	3,491	3,766
Fair value of plan assets	$ 4,061	$ 3,940
Weighted average assumptions used to determine obligations at end of year:
Discount rate	2.75%	2.38%
Rate of compensation increase	4.00%	4.00%
Assumed health care cost trend rates:
Ultimate rate	4.50%	5.00%	5.75%
Net loss reclassified from other comprehensive loss	$ 32	$ 41
Gain (loss) from change in discount rate	149	(305)
Gain (loss) from demographic change		(72)
Gain (loss) from valuation and experience	83	(61)
Gains (losses) from other economic assumption changes		124
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	2,073	2,083
Service cost	40	38	$ 30
Interest cost	52	63	77
Actuarial (gain) loss	(190)	(46)
Plan participants' contributions	29	29
Benefits paid	(100)	(94)
Projected benefit obligation at end of year	1,904	2,073	2,083
Change in plan assets
Fair value of plan assets at beginning of year	2,717	2,465
Actual return on plan assets	119	309
Employer contributions	7	8
Plan participants' contributions	29	29
Benefits paid	(100)	(94)
Fair value of plan assets at end of year	2,772	2,717	$ 2,465
Funded status at end of year	868	644
Amounts recognized in the consolidated balance sheets consist of:
Long-term assets	876	663
Current liabilities	(8)	(10)
Long-term liabilities		(9)
Amounts recognized in the consolidated balance sheets	868	644
Amounts recognized in accumulated other comprehensive loss consist of:
Net loss	1	1
Amounts recognized as a regulatory (liability)/asset	(886)	(671)
Total not yet recognized as income	$ (885)	$ (670)
Weighted average assumptions used to determine obligations at end of year:
Discount rate	2.95%	2.67%	3.32%
Assumed health care cost trend rates:
Rate assumed for following year	6.25%	6.50%
Ultimate rate	5.00%	5.00%	5.00%
Gain (loss) from change in discount rate	$ 83	$ (206)
Gain (loss) from demographic change		32
Gain (loss) from valuation and experience	113	169
Gains from mortality change		50
Postretirement Benefits Other Than Pensions | SCE
Change in projected benefit obligation
Projected benefit obligation at beginning of year	2,064	2,074
Service cost	40	37	$ 30
Interest cost	52	63	77
Actuarial (gain) loss	(190)	(45)
Plan participants' contributions	29	29
Benefits paid	(100)	(94)
Projected benefit obligation at end of year	1,895	2,064	2,074
Change in plan assets
Fair value of plan assets at beginning of year	2,717	2,464
Actual return on plan assets	119	309
Employer contributions	7	8
Plan participants' contributions	29	29
Benefits paid	(100)	(93)
Fair value of plan assets at end of year	2,772	2,717	$ 2,464
Funded status at end of year	877	653
Amounts recognized in the consolidated balance sheets consist of:
Long-term assets	885	663
Current liabilities	(8)	(10)
Amounts recognized in the consolidated balance sheets	877	653
Amounts recognized in accumulated other comprehensive loss consist of:
Amounts recognized as a regulatory (liability)/asset	(886)	(671)
Total not yet recognized as income	$ (886)	$ (671)
Weighted average assumptions used to determine obligations at end of year:
Discount rate	2.95%	2.67%
Assumed health care cost trend rates:
Rate assumed for following year	6.25%	6.50%
Ultimate rate	5.00%	5.00%