Variable Interest Entities (Recovery Funding) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Other current assets	$ 249	$ 292
Regulatory assets: Non-current	7,660	7,120
Regulatory liabilities: Current	(603)	(569)
Current portion of long-term debt	(1,077)	(1,029)
Other current liabilities	(1,667)	(1,612)
Long-term debt	(24,170)	(19,632)
SCE Recovery Funding LLC
Variable Interest Entity [Line Items]
Other current assets	19
Regulatory assets: Non-current	325
Regulatory liabilities: Current	(14)
Current portion of long-term debt	(14)
Other current liabilities	(1)
Long-term debt	(314)
SCE
Variable Interest Entity [Line Items]
Other current assets	222	285
Regulatory assets: Non-current	7,660	7,120
Regulatory liabilities: Current	(603)	(569)
Current portion of long-term debt	(377)	(1,029)
Other current liabilities	(1,631)	(1,294)
Long-term debt	(21,733)	$ (16,499)
SCE | Series 2021-A senior secured recovery bonds
Variable Interest Entity [Line Items]
Debt	338
SCE | SCE Recovery Funding LLC
Variable Interest Entity [Line Items]
Long-term debt	$ (314)