Derivative Instruments (Balance Sheet Disclosures) (Details) - Southern California Edison Company - Electric Utility - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Economic Hedges
Net Assets
Cash collateral not offset against derivative liabilities	$ 36
Other current assets \| Economic Hedges
Net Assets
Cash collateral not offset against derivative liabilities	28
Commodity derivative contracts
Derivative Assets
Gross amounts recognized	80	$ 173
Gross amounts offset in the consolidated balance sheets	(16)	0
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	64	173
Derivative Liabilities
Gross amounts recognized	24	13
Gross amounts offset in the consolidated balance sheets	(16)	0
Cash collateral posted	(8)	(7)
Net amounts presented in the consolidated balance sheets	0	6
Net Assets
Gross amounts recognized	56	160
Gross amounts offset in the consolidated balance sheets	0	0
Cash collateral posted	8	7
Net amounts presented in the consolidated balance sheets	64	167
Commodity derivative contracts \| Derivative Assets, Short-Term
Derivative Assets
Gross amounts recognized	63	171
Gross amounts offset in the consolidated balance sheets	(14)	0
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	49	171
Commodity derivative contracts \| Derivative Assets, Long-Term
Derivative Assets
Gross amounts recognized	17	2
Gross amounts offset in the consolidated balance sheets	(2)	0
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	15	2
Commodity derivative contracts \| Derivative Liability, Short-Term
Derivative Liabilities
Gross amounts recognized	22	13
Gross amounts offset in the consolidated balance sheets	(14)	0
Cash collateral posted	(8)	(7)
Net amounts presented in the consolidated balance sheets	0	6
Commodity derivative contracts \| Derivative Liability, Long-Term
Derivative Liabilities
Gross amounts recognized	2	0
Gross amounts offset in the consolidated balance sheets	(2)	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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