Leases (Supplemental Balance Sheet Information) (Details) $ in Millions	Dec. 31, 2019 USD ($)
Operating leases:
Operating lease ROU assets	$ 693
Current portion of operating lease liabilities	80
Operating lease liabilities	613
SCE
Operating leases:
Operating lease ROU assets	689
Current portion of operating lease liabilities	79
Operating lease liabilities	610
Total operating lease liabilities	689
Finance leases included in:
Utility property, plant and equipment, gross	14
Accumulated depreciation	(5)
Utility property, plant and equipment, net	9
Other current liabilities	1
Other long-term liabilities	8
Total finance lease liabilities	$ 9