Derivative Instruments (Balance Sheet Disclosures) (Details) - Southern California Edison Company - Electric Utility - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Economic Hedges
Net Assets
Cash collateral not offset against derivative liabilities	$ 46
Other current assets \| Economic Hedges
Net Assets
Cash collateral not offset against derivative liabilities	19
Commodity derivative contracts
Derivative Assets
Gross amounts recognized	66	$ 173
Gross amounts offset in the consolidated balance sheets	(3)	0
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	63	173
Derivative Liabilities
Gross amounts recognized	34	13
Gross amounts offset in the consolidated balance sheets	(3)	0
Cash collateral posted	(27)	(7)
Net amounts presented in the consolidated balance sheets	4	6
Net Assets
Gross amounts recognized	32	160
Gross amounts offset in the consolidated balance sheets	0	0
Cash collateral posted	27	7
Net amounts presented in the consolidated balance sheets	59	167
Commodity derivative contracts \| Derivative Assets, Short-Term
Derivative Assets
Gross amounts recognized	58	171
Gross amounts offset in the consolidated balance sheets	(3)	0
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	55	171
Commodity derivative contracts \| Derivative Assets, Long-Term
Derivative Assets
Gross amounts recognized	8	2
Gross amounts offset in the consolidated balance sheets	0	0
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	8	2
Commodity derivative contracts \| Derivative Liability, Short-Term
Derivative Liabilities
Gross amounts recognized	34	13
Gross amounts offset in the consolidated balance sheets	(3)	0
Cash collateral posted	(27)	(7)
Net amounts presented in the consolidated balance sheets	4	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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Fair value of securities pledged as collateral against derivative liabilities.

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