Compensation and Benefit Plans (Weighted Average Assumptions) (Details)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pension Plans
Pension and Other Postretirement Benefits [Line Items]
Discount rate	3.11%	4.19%	3.46%
Rate of compensation increase	4.10%	4.10%	4.10%
Expected long-term return on plan assets	6.00%	6.50%	6.50%
Interest crediting rate for cash balance account
Starting rate	3.61%	4.46%	4.36%
Ultimate rate	5.00%	5.75%	5.75%
Pension Plans \| SCE
Pension and Other Postretirement Benefits [Line Items]
Discount rate	3.11%	4.19%	3.46%
Rate of compensation increase	4.10%	4.10%	4.10%
Expected long-term return on plan assets	6.00%	6.50%	6.50%
Interest crediting rate for cash balance account
Starting rate	3.61%	4.46%	4.36%
Ultimate rate	5.00%	5.75%	5.75%
PBOP
Assumed health care cost trend rates:
Ultimate rate	5.00%	5.00%
PBOP \| SCE
Assumed health care cost trend rates:
Ultimate rate	5.00%	5.00%
Continuing Operations \| PBOP
Pension and Other Postretirement Benefits [Line Items]
Discount rate	3.32%	4.35%	3.70%
Expected long-term return on plan assets	4.90%	5.30%	5.30%
Assumed health care cost trend rates:
Current year	6.50%	6.75%	6.75%
Ultimate rate	5.00%	5.00%	5.00%
Continuing Operations \| PBOP \| SCE
Pension and Other Postretirement Benefits [Line Items]
Discount rate	3.32%	4.35%	3.70%
Expected long-term return on plan assets	4.90%	5.30%	5.30%
Assumed health care cost trend rates:
Current year	6.50%	6.75%	6.75%
Ultimate rate	5.00%	5.00%	5.00%

Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Starting Rate

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- Definition

Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Ultimate Rate

+ References

No definition available.

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- Definition

The assumed health care cost trend rate for the current fiscal year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based on the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population, by age and dependency status.

+ References

No definition available.

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- Definition

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

+ References

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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2919-114920

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- Definition

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

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

Ultimate trend rate for health care cost for defined benefit postretirement plan.

+ References

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