Recent Accounting Standards New Standards Adopted (Details) - USD ($) $ in Millions	3 Months Ended									6 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018	Dec. 31, 2015
New Accounting Pronouncement, Early Adoption [Line Items]
Operating Revenues		$ 2,468	$ 2,394		$ 2,818	$ 2,107	$ 2,254	$ 2,142	$ 2,591	$ 2,016	$ 9,696	$ 9,094	$ 8,966
Energy Costs											3,225	2,778	2,901
Operation and Maintenance											3,015	2,901	2,991
After-tax adjustment for new accounting standard						0						0		$ 176
Accumulated other comprehensive income (loss)		14,377				13,847					14,377	13,847	13,130		$ 13,067
Accounting Standards Update 2016-01 [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Pre-tax adjustment for new accounting standard														342
After-tax adjustment for new accounting standard														176
PSE&G [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Operating Revenues		1,645	1,595	$ 1,386	1,845	1,575	1,530	1,393	1,826		6,471	6,324	6,303
Energy Costs											2,520	2,421	2,644
Operation and Maintenance											1,575	1,458	1,465
Accumulated other comprehensive income (loss)		10,900				9,834					10,900	9,834	8,712		7,573
PSE&G [Member] | Accounting Standard Update 2017-07 [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Estimated Change in Expense related to new presentation of pension and OPEB costs											58
Prior Period Reclassification Adjustment												8	15
PSE&G [Member] | Accounting Standards Update 2018-02 [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Operating Revenues											81
Accumulated other comprehensive income (loss)		81									81
Power [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Operating Revenues		1,108	$ 868	$ 767	$ 1,403	827	$ 846	$ 918	$ 1,269		4,146	3,860	3,861
Energy Costs											2,197	1,913	1,824
Operation and Maintenance											999	1,046	1,139
After-tax adjustment for new accounting standard						0						0		$ 175
Accumulated other comprehensive income (loss)		5,960				$ 5,967					5,960	5,967	5,799		$ 6,002
Power [Member] | Accounting Standard Update 2017-07 [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Prior Period Reclassification Adjustment												(8)	4
Power [Member] | Accounting Standards Update 2018-02 [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Operating Revenues											69
Accumulated other comprehensive income (loss)		$ 69									$ 69
Subsequent Event [Member] | Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Estimated Change in Expense related to new presentation of pension and OPEB costs	$ 280
Subsequent Event [Member] | PSE&G [Member] | Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Estimated Change in Expense related to new presentation of pension and OPEB costs	100
Subsequent Event [Member] | Power [Member] | Accounting Standards Update 2016-02 [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Estimated Change in Expense related to new presentation of pension and OPEB costs	$ 50
Restatement Adjustment [Member] | PSE&G [Member] | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Operating Revenues												90	(82)
Energy Costs												58	77
Operation and Maintenance												32	5
Restatement Adjustment [Member] | Power [Member] | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncement, Early Adoption [Line Items]
Operating Revenues												70	162
Energy Costs												$ (70)	$ (162)