Leases (Summary of Lease Payments) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($) lease	Mar. 31, 2019 USD ($)
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 contracts | lease	2
Contract commitments	$ 26
PPA Operating Leases
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	42
2020	31
2021	27
2022	22
2023	17
Thereafter	101
Total lease payments	$ 240
Southern California Edison
Operating Leases
Lease liabilities		$ 928
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
Southern California Edison | PPA Operating Leases
Operating Leases
2019		118
2020		124
2021		103
2022		79
2023		47
Thereafter		536
Total lease payments		1,007
Amount representing interest3		249
Lease liabilities		758
Southern California Edison | Other Operating Leases
Operating Leases
2019		32
2020		33
2021		27
2022		22
2023		17
Thereafter		101
Total lease payments		232
Amount representing interest3		62
Lease liabilities		$ 170