Leases (Supplemental Balance Sheet Information) (Details) $ in Millions	Jun. 30, 2019 USD ($)
Operating leases:
Operating lease right-of-use assets	$ 742
Current portion of operating lease liabilities	108
Operating lease liabilities	634
Southern California Edison
Operating leases:
Operating lease right-of-use assets	738
Current portion of operating lease liabilities	107
Operating lease liabilities	631
Total operating lease liabilities	738
Finance leases included in:
Utility property, plant and equipment, gross	14
Accumulated depreciation	(4)
Utility property, plant and equipment, net	10
Other current liabilities	1
Other long-term liabilities	9
Total finance lease liabilities	$ 10