Leases (Supplemental Balance Sheet Information) (Details) $ in Millions	Sep. 30, 2019 USD ($)
Operating leases:
Operating lease right-of-use assets	$ 705
Current portion of operating lease liabilities	91
Operating lease liabilities	615
Southern California Edison
Operating leases:
Operating lease right-of-use assets	701
Current portion of operating lease liabilities	90
Operating lease liabilities	611
Total operating lease liabilities	701
Finance leases included in:
Utility property, plant and equipment, gross	14
Accumulated depreciation	(5)
Utility property, plant and equipment, net	9
Other current liabilities	0
Other long-term liabilities	9
Total finance lease liabilities	$ 9