Leases (Balance Sheet) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating leases:
Operating lease right-of-use assets	$ 1,932	$ 1,088
Current portion of operating lease liabilities	582	215
Operating lease liabilities	$ 1,350	$ 873
Finance leases included in:
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Public Utilities, Property, Plant and Equipment, Net	Public Utilities, Property, Plant and Equipment, Net
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other Liabilities, Noncurrent	Other Liabilities, Noncurrent
SCE
Operating leases:
Operating lease right-of-use assets	$ 1,925	$ 1,085
Current portion of operating lease liabilities	582	214
Operating lease liabilities	1,343	871
Total operating lease liabilities	1,925	1,085
Finance leases included in:
Utility property, plant and equipment, gross	4	4
Accumulated depreciation	(1)
Utility property, plant and equipment, net	3	4
Other long-term liabilities	3	4
Total finance lease liabilities	3	4
SCE | PPA Operating Leases
Operating leases:
Total operating lease liabilities	1,713
Finance leases included in:
Operating ROU assets obtained in exchange for lease obligations	1,084	463
SCE | Other operating leases
Operating leases:
Total operating lease liabilities	212
Finance leases included in:
Operating ROU assets obtained in exchange for lease obligations	$ 71	$ 58	$ 34