Compensation and Benefit Plans (Plan Assets and Benefit Obligation) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Amounts recognized in the consolidated balance sheets consist of:
Long-term liabilities	$ (1,354,000,000)	$ (1,759,000,000)
Assumed health care cost trend rates:
Net loss reclassified from other comprehensive loss	0	0	$ 3,000,000
SCE
Amounts recognized in the consolidated balance sheets consist of:
Long-term liabilities	(896,000,000)	(1,284,000,000)
Pension Plans
Change in projected benefit obligation
Projected benefit obligation at beginning of year	4,374,000,000	4,517,000,000
Service cost	139,000,000	142,000,000
Interest cost	171,000,000	170,000,000
Actuarial gain	(125,000,000)	(149,000,000)
Benefits paid	(275,000,000)	(305,000,000)
Other	0	(1,000,000)
Projected benefit obligation at end of year	4,284,000,000	4,374,000,000	4,517,000,000
Change in plan assets
Fair value of plan assets at beginning of year	3,298,000,000	3,454,000,000
Actual return on plan assets	262,000,000	30,000,000
Employer contributions	103,000,000	119,000,000
Benefits paid	(275,000,000)	(305,000,000)
Fair value of plan assets at end of year	3,388,000,000	3,298,000,000	3,454,000,000
Funded status at end of year	(896,000,000)	(1,076,000,000)
Amounts recognized in the consolidated balance sheets consist of:
Long-term assets	2,000,000	0
Current liabilities	(50,000,000)	(27,000,000)
Long-term liabilities	(848,000,000)	(1,049,000,000)
Total liabilities	(896,000,000)	(1,076,000,000)
Amounts recognized in accumulated other comprehensive loss consist of:
Prior service cost	(1,000,000)	0
Net loss	(93,000,000)	(96,000,000)
Total amounts recognized in accumulated other comprehensive loss	(92,000,000)	(96,000,000)
Amounts recognized as a regulatory asset	574,000,000	675,000,000
Total not yet recognized as expense	666,000,000	771,000,000
Accumulated benefit obligation at end of year	4,138,000,000	4,200,000,000
Pension plans with an accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	4,284,000,000	4,374,000,000
Accumulated benefit obligation	4,138,000,000	4,200,000,000
Fair value of plan assets	$ 3,388,000,000	$ 3,298,000,000
Weighted-average assumptions used to determine obligations at end of year:
Discount rate	3.94%	4.18%
Rate of compensation increase	4.00%	4.00%
Assumed health care cost trend rates:
Net loss	$ (92,000,000)	$ (96,000,000)
Pension Plans | Edison International
Assumed health care cost trend rates:
Long-term payable	124,000,000	123,000,000
Pension Plans | SCE
Change in projected benefit obligation
Projected benefit obligation at beginning of year	3,878,000,000	3,999,000,000
Service cost	132,000,000	133,000,000
Interest cost	150,000,000	150,000,000
Actuarial gain	(140,000,000)	(143,000,000)
Benefits paid	(229,000,000)	(261,000,000)
Other	0	0
Projected benefit obligation at end of year	3,791,000,000	3,878,000,000	3,999,000,000
Change in plan assets
Fair value of plan assets at beginning of year	3,080,000,000	3,217,000,000
Actual return on plan assets	239,000,000	27,000,000
Employer contributions	82,000,000	97,000,000
Benefits paid	(229,000,000)	(261,000,000)
Fair value of plan assets at end of year	3,172,000,000	3,080,000,000	3,217,000,000
Funded status at end of year	(619,000,000)	(798,000,000)
Amounts recognized in the consolidated balance sheets consist of:
Long-term assets	0	0
Current liabilities	(4,000,000)	(4,000,000)
Long-term liabilities	(615,000,000)	(794,000,000)
Total liabilities	(619,000,000)	(798,000,000)
Amounts recognized in accumulated other comprehensive loss consist of:
Prior service cost	0	0
Net loss	(24,000,000)	(27,000,000)
Total amounts recognized in accumulated other comprehensive loss	(24,000,000)	(27,000,000)
Amounts recognized as a regulatory asset	574,000,000	675,000,000
Total not yet recognized as expense	598,000,000	702,000,000
Accumulated benefit obligation at end of year	3,683,000,000	3,744,000,000
Pension plans with an accumulated benefit obligation in excess of plan assets:
Projected benefit obligation	3,791,000,000	3,878,000,000
Accumulated benefit obligation	3,683,000,000	3,744,000,000
Fair value of plan assets	$ 3,172,000,000	$ 3,080,000,000
Weighted-average assumptions used to determine obligations at end of year:
Discount rate	3.94%	4.18%
Rate of compensation increase	4.00%	4.00%
Assumed health care cost trend rates:
Net loss	$ (24,000,000)	$ (27,000,000)
Net loss reclassified from other comprehensive loss	20,000,000	18,000,000
Postretirement Benefits Other Than Pensions
Change in projected benefit obligation
Projected benefit obligation at beginning of year	2,350,000,000	2,784,000,000
Service cost	35,000,000	46,000,000	40,000,000
Interest cost	97,000,000	102,000,000	117,000,000
Special termination benefits	2,000,000	(2,000,000)
Plan Amendments	(6,000,000)	0
Actuarial gain	(110,000,000)	(500,000,000)
Plan participants' contributions	19,000,000	20,000,000
Benefits paid	(111,000,000)	(100,000,000)
Projected benefit obligation at end of year	2,276,000,000	2,350,000,000	2,784,000,000
Change in plan assets
Fair value of plan assets at beginning of year	2,036,000,000	2,086,000,000
Actual return on plan assets	137,000,000	6,000,000
Employer contributions	21,000,000	24,000,000
Plan participants' contributions	19,000,000	20,000,000
Benefits paid	(111,000,000)	(100,000,000)
Fair value of plan assets at end of year	2,102,000,000	2,036,000,000	$ 2,086,000,000
Funded status at end of year	(174,000,000)	(314,000,000)
Amounts recognized in the consolidated balance sheets consist of:
Current liabilities	(14,000,000)	(15,000,000)
Long-term liabilities	(160,000,000)	(299,000,000)
Total liabilities	(174,000,000)	(314,000,000)
Amounts recognized in accumulated other comprehensive loss consist of:
Total amounts recognized in accumulated other comprehensive loss	(4,000,000)	(4,000,000)
Amounts recognized as a regulatory asset	136,000,000	174,000,000
Total not yet recognized as expense	$ 140,000,000	$ 178,000,000
Weighted-average assumptions used to determine obligations at end of year:
Discount rate	4.29%	4.55%	4.16%
Assumed health care cost trend rates:
Rate assumed for following year	7.00%	7.50%
Ultimate rate	5.00%	5.00%
Net loss	$ (4,000,000)	$ (4,000,000)
Postretirement Benefits Other Than Pensions | SCE
Change in projected benefit obligation
Projected benefit obligation at beginning of year	2,341,000,000	2,775,000,000
Service cost	34,000,000	46,000,000	$ 40,000,000
Interest cost	97,000,000	102,000,000	117,000,000
Special termination benefits	2,000,000	(2,000,000)
Plan Amendments	(6,000,000)	0
Actuarial gain	(110,000,000)	(500,000,000)
Plan participants' contributions	19,000,000	20,000,000
Benefits paid	(111,000,000)	(100,000,000)
Projected benefit obligation at end of year	2,266,000,000	2,341,000,000	2,775,000,000
Change in plan assets
Fair value of plan assets at beginning of year	2,036,000,000	2,086,000,000
Actual return on plan assets	137,000,000	6,000,000
Employer contributions	21,000,000	24,000,000
Plan participants' contributions	19,000,000	20,000,000
Benefits paid	(111,000,000)	(100,000,000)
Fair value of plan assets at end of year	2,102,000,000	2,036,000,000	$ 2,086,000,000
Funded status at end of year	(164,000,000)	(305,000,000)
Amounts recognized in the consolidated balance sheets consist of:
Current liabilities	(13,000,000)	(15,000,000)
Long-term liabilities	(151,000,000)	(290,000,000)
Total liabilities	(164,000,000)	(305,000,000)
Amounts recognized in accumulated other comprehensive loss consist of:
Total amounts recognized in accumulated other comprehensive loss	0	0
Amounts recognized as a regulatory asset	136,000,000	174,000,000
Total not yet recognized as expense	$ 136,000,000	$ 174,000,000
Weighted-average assumptions used to determine obligations at end of year:
Discount rate	4.29%	4.55%
Assumed health care cost trend rates:
Rate assumed for following year	7.00%	7.50%
Ultimate rate	5.00%	5.00%
Net loss	$ 0	$ 0