Derivative Instruments (Balance Sheet Disclosures) (Details) - Southern California Edison Company - Electric Utility - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Economic Hedges
Net Assets
Cash collateral not offset against derivative liabilities	$ 11
Commodity derivative contracts
Derivative Assets
Gross amounts recognized	112	$ 173
Gross amounts offset in the consolidated balance sheets	(1)	0
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	111	173
Derivative Liabilities
Gross amounts recognized	2	13
Gross amounts offset in the consolidated balance sheets	(1)	0
Cash collateral posted	0	(7)
Net amounts presented in the consolidated balance sheets	1	6
Net Assets
Gross amounts recognized	110	160
Gross amounts offset in the consolidated balance sheets	0	0
Cash collateral posted	0	7
Net amounts presented in the consolidated balance sheets	110	167
Commodity derivative contracts \| Derivative Assets, Short-Term
Derivative Assets
Gross amounts recognized	102	171
Gross amounts offset in the consolidated balance sheets	(1)	0
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	101	171
Commodity derivative contracts \| Derivative Assets, Long-Term
Derivative Assets
Gross amounts recognized	10	2
Gross amounts offset in the consolidated balance sheets	0	0
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	10	2
Commodity derivative contracts \| Derivative Liability, Short-Term
Derivative Liabilities
Gross amounts recognized	2	13
Gross amounts offset in the consolidated balance sheets	(1)	0
Cash collateral posted	0	(7)
Net amounts presented in the consolidated balance sheets	1	6
Commodity derivative contracts \| Derivative Liability, Long-Term
Derivative Liabilities
Gross amounts recognized	0	0
Gross amounts offset in the consolidated balance sheets	0	0
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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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 of securities pledged as collateral against derivative liabilities.

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