Leases (Summary of Lease Payments) (Details) - Southern California Edison $ in Millions	3 Months Ended
	Jun. 30, 2019 USD ($) contract	Dec. 31, 2018 USD ($)
Operating Leases
Lease liabilities	$ 738
Finance Leases
2019	1
2020	1
2021	1
2022	2
2023	2
Thereafter	9
Total lease payments	16
Amount representing interest	6
Lease liabilities	$ 10
Capital Leases
2019		$ 5
2020		6
2021		6
2022		6
2023		5
Thereafter		66
Total lease payments		94
Amount representing executory costs		(25)
Amount representing interest		(33)
Net commitments		36
Number of power contracts amended | contract	3
Reduction in ROU assets	$ (161)
Reduction in lease liabilities	124
PPA Operating Leases
Operating Leases
2019	58
2020	70
2021	48
2022	48
2023	47
Thereafter	536
Total lease payments	807
Amount representing interest4	232
Lease liabilities	575
Operating Leases
2019		148
2020		124
2021		103
2022		79
2023		47
Thereafter		536
Total lease payments		1,037
Other Operating Leases
Operating Leases
2019	21
2020	33
2021	27
2022	22
2023	17
Thereafter	104
Total lease payments	224
Amount representing interest4	61
Lease liabilities	$ 163
Operating Leases
2019		42
2020		31
2021		27
2022		22
2023		17
Thereafter		101
Total lease payments		$ 240