Summary of Significant Accounting Policies (Emission Allowances) (Details) - SCE - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Significant Accounting Policies [Line Items]
Regulatory liabilities	$ 9,175	$ 9,584
LCFS net sales proceeds
Significant Accounting Policies [Line Items]
Regulatory liabilities	218	193
Other Current Assets
Significant Accounting Policies [Line Items]
GHG allowances	87	47
GHG emission obligations	$ 55
Other Current Liabilities
Significant Accounting Policies [Line Items]
GHG emission obligations		$ 34