Derivative Instruments (Balance Sheet Disclosures) (Details) - SCE - Commodity derivative contracts - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Derivative Assets
Gross amounts recognized	$ 117	$ 126
Gross amounts offset in the consolidated balance sheets	(18)	(18)
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	99	108
Derivative Liabilities
Gross amounts recognized	18	22
Gross amounts offset in the consolidated balance sheets	(18)	(18)
Cash collateral posted	0	(4)
Net amounts presented in the consolidated balance sheets	0	0
Net Asset
Gross amounts recognized	99	104
Gross amounts offset in the consolidated balance sheets	0	0
Netting and Collateral, Total	0	4
Net amounts presented in the consolidated balance sheets	99	108
Posted collateral	2	17
Cash collateral not offset		13
Other current assets
Derivative Assets
Gross amounts recognized	97	103
Gross amounts offset in the consolidated balance sheets	(13)	(12)
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	84	91
Other long-term assets
Derivative Assets
Gross amounts recognized	20	23
Gross amounts offset in the consolidated balance sheets	(5)	(6)
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	15	17
Other current liabilities
Derivative Liabilities
Gross amounts recognized	13	16
Gross amounts offset in the consolidated balance sheets	(13)	(12)
Cash collateral posted	0	(4)
Net amounts presented in the consolidated balance sheets	0	0
Other long-term liabilities
Derivative Liabilities
Gross amounts recognized	5	6
Gross amounts offset in the consolidated balance sheets	(5)	(6)
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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Derivative, Fair Value, Gross

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Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

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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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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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