Derivative Instruments (Balance Sheet Disclosures) (Details) - SCE - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Net Asset
Cash collateral that is not offset against derivative liabilities	$ 24
Commodity derivative contracts \| Electric Utility
Derivative Assets
Gross amounts recognized	102	$ 173
Gross amounts offset in the consolidated balance sheets	(15)	0
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	87	173
Derivative Liabilities
Gross amounts recognized	16	13
Gross amounts offset in the consolidated balance sheets	(15)	0
Cash collateral posted2	0	(7)
Net amounts presented in the consolidated balance sheets	1	6
Net Asset
Gross amounts recognized	86	160
Gross amounts offset in the consolidated balance sheets	0	0
Cash collateral posted	0	7
Net amounts presented in the consolidated balance sheets	86	167
Commodity derivative contracts \| Derivative Assets, Short-Term \| Electric Utility
Derivative Assets
Gross amounts recognized	94	171
Gross amounts offset in the consolidated balance sheets	(13)	0
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	81	171
Commodity derivative contracts \| Derivative Assets, Long-Term \| Electric Utility
Derivative Assets
Gross amounts recognized	8	2
Gross amounts offset in the consolidated balance sheets	(2)	0
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	6	2
Commodity derivative contracts \| Derivative Liability, Short-Term \| Electric Utility
Derivative Liabilities
Gross amounts recognized	14	13
Gross amounts offset in the consolidated balance sheets	(13)	0
Cash collateral posted2	0	(7)
Net amounts presented in the consolidated balance sheets	1	6
Commodity derivative contracts \| Derivative Liability, Long-Term \| Electric Utility
Derivative Liabilities
Gross amounts recognized	2	0
Gross amounts offset in the consolidated balance sheets	(2)	0
Cash collateral posted2	0	0
Net amounts presented in the consolidated balance sheets	$ 0	$ 0

Derivative, Collateral, Obligation To Return (Right To Reclaim) Cash

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Derivative, Fair Value, Gross

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The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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The net amount as of the balance sheet date of the fair value of derivative assets and derivative liabilities that in accordance with the entity's accounting policy were offset against collateral under a master netting arrangement.

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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value, after effects of master netting arrangements, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset offset against the right to receive collateral. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Fair value of asset associated with financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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