Leases Leases (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) renewals
Lessee, Lease, Description [Line Items]
Lease not yet commenced	$ 35
Lessor leases carrying value	272
Pse And G
Lessee, Lease, Description [Line Items]
Operating Lease, Liability, Current	$ 11
Pse And G | Minimum
Lessee, Lease, Description [Line Items]
Lease renewal term	1 year
Pse And G | Maximum
Lessee, Lease, Description [Line Items]
Lease renewal term	5 years
Power
Lessee, Lease, Description [Line Items]
Operating Lease, Liability, Current	$ 4
Lease renewal term	5 years
Number of lease renewal terms | renewals	1
Lessor leases carrying value	$ 331
Power | Minimum
Lessee, Lease, Description [Line Items]
Lease renewal term	15 years
Power | Maximum
Lessee, Lease, Description [Line Items]
Lease renewal term	20 years
PSEG
Lessee, Lease, Description [Line Items]
Operating Lease, Liability, Current	$ 25
Services | Subsidiaries
Lessee, Lease, Description [Line Items]
Lease renewal term	5 years
Number of lease renewal terms | renewals	2
Energy Holdings | Subsidiaries
Lessee, Lease, Description [Line Items]
Lease renewal term	5 years
Number of lease renewal terms | renewals	8
Lessor leases carrying value	$ 24