Derivative Instruments (Balance Sheet) (Details) - SCE - Commodity derivative contracts - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivative Assets
Gross amounts recognized	$ 241	$ 126
Gross amounts offset in the consolidated balance sheets	(11)	(18)
Cash collateral posted	(86)	0
Net amounts presented in the consolidated balance sheets	144	108
Cash collateral received for asset	86
Derivative Liabilities
Gross amounts recognized	11	22
Gross amounts offset in the consolidated balance sheets	(11)	(18)
Cash collateral posted	0	(4)
Net amounts presented in the consolidated balance sheets	0	0
Cash collateral posted for liability		17
Net Asset
Gross amounts recognized	230	104
Gross amounts offset in the consolidated balance sheets	0	0
Netting and Collateral, Total	(86)	4
Net amounts presented in the consolidated balance sheets	144	108
Other current assets
Derivative Assets
Gross amounts recognized	213	103
Gross amounts offset in the consolidated balance sheets	(8)	(12)
Cash collateral posted	(86)	0
Net amounts presented in the consolidated balance sheets	119	91
Derivative Liabilities
Cash collateral posted for liability		13
Other long-term assets
Derivative Assets
Gross amounts recognized	28	23
Gross amounts offset in the consolidated balance sheets	(3)	(6)
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	25	17
Other current liabilities
Derivative Liabilities
Gross amounts recognized	8	16
Gross amounts offset in the consolidated balance sheets	(8)	(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	3	6
Gross amounts offset in the consolidated balance sheets	(3)	(6)
Cash collateral posted	0	0
Net amounts presented in the consolidated balance sheets	0	0
Cash
Derivative Assets
Cash collateral received for asset	76
Accounts Receivable
Derivative Assets
Cash collateral received for asset	$ 10
Derivative
Derivative Liabilities
Cash collateral posted for liability		$ 4

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