Derivative Instruments (Balance Sheet Disclosures) (Details) - Southern California Edison Company - Electric Utility - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Economic Hedges
Derivative Assets
Cash collateral posted	$ (52)
Other current assets \| Economic Hedges
Derivative Assets
Cash collateral posted	(22)	$ (24)
Commodity derivative contracts
Derivative Assets
Gross amounts recognized	58	102
Gross amounts offset in the consolidated balance sheets	(6)	(15)
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	52	87
Derivative Liabilities
Gross amounts recognized	55	16
Gross amounts offset in the consolidated balance sheets	(6)	(15)
Cash collateral posted	(30)	0
Net amounts presented in the consolidated balance sheets	19	1
Net Assets
Gross amounts recognized	3	86
Gross amounts offset in the consolidated balance sheets	0	0
Cash collateral posted	30	0
Net amounts presented in the consolidated balance sheets	33	86
Commodity derivative contracts \| Derivative Assets, Short-Term
Derivative Assets
Gross amounts recognized	57	94
Gross amounts offset in the consolidated balance sheets	(6)	(13)
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	51	81
Commodity derivative contracts \| Derivative Assets, Long-Term
Derivative Assets
Gross amounts recognized	1	8
Gross amounts offset in the consolidated balance sheets	0	(2)
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	1	6
Commodity derivative contracts \| Derivative Liability, Short-Term
Derivative Liabilities
Gross amounts recognized	55	14
Gross amounts offset in the consolidated balance sheets	(6)	(13)
Cash collateral posted	(30)	0
Net amounts presented in the consolidated balance sheets	19	1
Commodity derivative contracts \| Derivative Liability, Long-Term
Derivative Liabilities
Gross amounts recognized	0	2
Gross amounts offset in the consolidated balance sheets	0	(2)
Cash collateral posted	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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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, 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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