Debt and Credit Agreements (Long-term Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Current portion of long-term debt	$ (79)	$ (481)
Long-term debt	14,632	11,642
Edison International Parent and Other
Debt Instrument [Line Items]
Other long-term debt	0	29
Current portion of long-term debt	0	(2)
Unamortized debt discount and issuance costs, net	(10)	(13)
Long-term debt	1,740	1,214
Edison International Parent and Other \| Debentures and notes
Debt Instrument [Line Items]
Long-term debt	$ 1,750	1,200
Edison International Parent and Other \| Debentures and notes \| Minimum
Debt Instrument [Line Items]
Interest rate on debt (as a percent)	2.125%
Edison International Parent and Other \| Debentures and notes \| Maximum
Debt Instrument [Line Items]
Interest rate on debt (as a percent)	4.125%
SCE
Debt Instrument [Line Items]
Current portion of long-term debt	$ (79)	(479)
Unamortized debt discount and issuance costs, net	(137)	(88)
Long-term debt	12,892	10,428
SCE \| Debentures and notes
Debt Instrument [Line Items]
Long-term debt	$ 306	307
SCE \| Debentures and notes \| Minimum
Debt Instrument [Line Items]
Interest rate on debt (as a percent)	5.06%
SCE \| Debentures and notes \| Maximum
Debt Instrument [Line Items]
Interest rate on debt (as a percent)	6.65%
SCE \| First and refunding mortgage bonds
Debt Instrument [Line Items]
Long-term debt	$ 12,050	9,779
SCE \| First and refunding mortgage bonds \| Minimum
Debt Instrument [Line Items]
Interest rate on debt (as a percent)	1.845%
SCE \| First and refunding mortgage bonds \| Maximum
Debt Instrument [Line Items]
Interest rate on debt (as a percent)	6.05%
SCE \| Pollution-control bonds
Debt Instrument [Line Items]
Long-term debt	$ 752	909
SCE \| Pollution-control bonds \| Minimum
Debt Instrument [Line Items]
Interest rate on debt (as a percent)	1.875%
SCE \| Pollution-control bonds \| Maximum
Debt Instrument [Line Items]
Interest rate on debt (as a percent)	5.00%
SoCore Energy
Debt Instrument [Line Items]
Other long-term debt		$ 29

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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