Derivative Instruments (Balance Sheet) (Details) - SCE - Commodity derivative contracts - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Derivative Assets
Gross amounts recognized	$ 76	$ 126
Gross amounts offset in the consolidated balance sheets	(32)	(18)
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	44	108
Derivative Liabilities
Gross amounts recognized	48	22
Gross amounts offset in the consolidated balance sheets	(32)	(18)
Cash collateral posted	(16)	(4)
Net amounts presented in the consolidated balance sheets	0	0
Cash collateral posted for liability	65	17
Net Asset
Gross amounts recognized	28	104
Gross amounts offset in the consolidated balance sheets	0	0
Netting and Collateral, Total	16	4
Net amounts presented in the consolidated balance sheets	44	108
Other Current Assets
Derivative Assets
Gross amounts recognized	70	103
Gross amounts offset in the consolidated balance sheets	(30)	(12)
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	40	91
Derivative Liabilities
Cash collateral posted for liability	49	13
Other long-term assets
Derivative Assets
Gross amounts recognized	6	23
Gross amounts offset in the consolidated balance sheets	(2)	(6)
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	4	17
Other Current Liabilities
Derivative Liabilities
Gross amounts recognized	46	16
Gross amounts offset in the consolidated balance sheets	(30)	(12)
Cash collateral posted	(16)	(4)
Net amounts presented in the consolidated balance sheets	0	0
Other long-term liabilities
Derivative Liabilities
Gross amounts recognized	2	6
Gross amounts offset in the consolidated balance sheets	(2)	(6)
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	0	0
Derivative
Derivative Liabilities
Cash collateral posted for liability	$ 16	$ 4

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