Leases Operating Lease Liabilities (Details) $ in Millions	Mar. 31, 2019 USD ($)
Operating Lease Liabilities, Payments Due [Abstract]
2019	$ 28
2020	31
2021	30
2022	29
2023	26
2024	24
Thereafter	196
Total Minimum Lease Payments	364
Pse And G
Operating Lease Liabilities, Payments Due [Abstract]
2019	11
2020	11
2021	10
2022	8
2023	8
2024	7
Thereafter	60
Total Minimum Lease Payments	115
Power
Operating Lease Liabilities, Payments Due [Abstract]
2019	5
2020	4
2021	4
2022	5
2023	3
2024	3
Thereafter	46
Total Minimum Lease Payments	70
Other
Operating Lease Liabilities, Payments Due [Abstract]
2019	12
2020	16
2021	16
2022	16
2023	15
2024	14
Thereafter	90
Total Minimum Lease Payments	$ 179