Derivative Instruments (Balance Sheet) (Details) - SCE - Commodity derivative contracts - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Derivative Assets
Gross amounts recognized	$ 100	$ 76
Gross amounts offset in the consolidated balance sheets	(18)	(32)
Cash collateral posted	(19)	0
Net amounts presented in the consolidated balance sheets	63	44
Cash collateral received for asset	21
Derivative Liabilities
Gross amounts recognized	18	48
Gross amounts offset in the consolidated balance sheets	(18)	(32)
Cash collateral posted	0	(16)
Net amounts presented in the consolidated balance sheets	0	0
Cash collateral posted for liability		65
Net Asset
Gross amounts recognized	82	28
Gross amounts offset in the consolidated balance sheets	0	0
Netting and Collateral, Total	(19)	16
Net amounts presented in the consolidated balance sheets	63	44
Other Current Assets
Derivative Assets
Gross amounts recognized	95	70
Gross amounts offset in the consolidated balance sheets	(17)	(30)
Cash collateral posted	(19)	0
Net amounts presented in the consolidated balance sheets	59	40
Cash collateral received for asset	2
Derivative Liabilities
Cash collateral posted for liability		49
Other long-term assets
Derivative Assets
Gross amounts recognized	5	6
Gross amounts offset in the consolidated balance sheets	(1)	(2)
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	4	4
Other Current Liabilities
Derivative Liabilities
Gross amounts recognized	17	46
Gross amounts offset in the consolidated balance sheets	(17)	(30)
Cash collateral posted	0	(16)
Net amounts presented in the consolidated balance sheets	0	0
Other long-term liabilities
Derivative Liabilities
Gross amounts recognized	1	2
Gross amounts offset in the consolidated balance sheets	(1)	(2)
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	0	0
Derivative
Derivative Assets
Cash collateral received for asset	$ 19
Derivative Liabilities
Cash collateral posted for liability		$ 16

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