Derivative Instruments (Balance Sheet Disclosures) (Details) - SCE - Commodity derivative contracts - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Derivative Assets
Gross amounts recognized	$ 131	$ 126
Gross amounts offset in the consolidated balance sheets	(16)	(18)
Cash collateral posted	(26)	0
Net amounts presented in the consolidated balance sheets	89	108
Derivative Liabilities
Gross amounts recognized	16	22
Gross amounts offset in the consolidated balance sheets	(16)	(18)
Cash collateral posted	0	(4)
Net amounts presented in the consolidated balance sheets	0	0
Net Asset
Gross amounts recognized	115	104
Gross amounts offset in the consolidated balance sheets	0	0
Netting and Collateral, Total	(26)	4
Net amounts presented in the consolidated balance sheets	89	108
Cash collateral received for asset	30
Cash collateral not offset against asset	4
Cash collateral received for liability		17
Cash collateral not offset against liability		13
Other current assets
Derivative Assets
Gross amounts recognized	115	103
Gross amounts offset in the consolidated balance sheets	(12)	(12)
Cash collateral posted	(26)	0
Net amounts presented in the consolidated balance sheets	77	91
Other long-term assets
Derivative Assets
Gross amounts recognized	16	23
Gross amounts offset in the consolidated balance sheets	(4)	(6)
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	12	17
Other current liabilities
Derivative Liabilities
Gross amounts recognized	12	16
Gross amounts offset in the consolidated balance sheets	(12)	(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	4	6
Gross amounts offset in the consolidated balance sheets	(4)	(6)
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	$ 0	$ 0

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