Debt and Credit Agreements (Long-Term Debt) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Current portion of long-term debt	$ (504)us-gaap_LongTermDebtCurrent	$ (601)us-gaap_LongTermDebtCurrent
Long-term debt	10,234us-gaap_LongTermDebtNoncurrent	9,825us-gaap_LongTermDebtNoncurrent
Edison International
Debt Instrument [Line Items]
Current portion of long-term debt	(204)	0
Long-term debt	610	400
Edison International \| Debentures and notes:
Debt Instrument [Line Items]
Interest rate on debt, minimum (as a percent)	0.00%
Interest rate on debt, maximum (as a percent)	3.75%
Edison International Parent and Other:
Debt Instrument [Line Items]
Other long-term debt	2	4
Current portion of long-term debt	(204)	(1)
Unamortized debt discount, net	(5)	0
Long-term debt	610	403
Edison International Parent and Other: \| Debentures and notes:
Debt Instrument [Line Items]
Long-term Debt, Gross	817	400
Southern California Edison
Debt Instrument [Line Items]
Current portion of long-term debt	(300)	(600)
Unamortized debt discount, net	(37)	(38)
Long-term debt	9,624	9,422
Southern California Edison \| Debentures and notes:
Debt Instrument [Line Items]
Long-term Debt, Gross	307	307
Interest rate on debt, minimum (as a percent)	5.06%
Interest rate on debt, maximum (as a percent)	6.65%
Southern California Edison \| First and refunding mortgage bonds:
Debt Instrument [Line Items]
Long-term Debt, Gross	8,875	8,975
Interest rate on debt, minimum (as a percent)	1.125%
Interest rate on debt, maximum (as a percent)	6.05%
Southern California Edison \| Pollution-control bonds:
Debt Instrument [Line Items]
Long-term Debt, Gross	940	939
Interest rate on debt, minimum (as a percent)	1.375%
Interest rate on debt, maximum (as a percent)	5.00%
Southern California Edison \| Bonds repurchased
Debt Instrument [Line Items]
Long-term Debt, Gross	$ (161)	$ (161)

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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- Definition

Maximum contractual interest rate for funds borrowed, under the debt agreement.

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Minimum contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

+ References

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-Publisher FASB

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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Including both current and noncurrent portions, carrying amount as of the balance sheet date of other forms of debt not elsewhere specified in the taxonomy with initial maturities beyond one year or beyond the normal operating cycle, if longer.

+ References

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-Publisher FASB

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