Rate Filings (Details) (PSE And G [Member], USD $) In Millions, unless otherwise specified	2 Months Ended				12 Months Ended
	Mar. 31, 2014	Jun. 30, 2014	May 31, 2014	Apr. 18, 2014	Sep. 30, 2015 Subsequent Event [Member]
Regulatory Assets And Liabilities [Line Items]
Request for RAC Recovery				$ 66
Approved WNC Carryover Deficiency Revenues Recovery				26
Request to Refund WNC overrecovery		45
Self Implementing Bill Credit per therm	0.25
Self Implementing BGSS rate credit to residential customers	93
BGSS Revenue Reduction					112
Current BGSS rate per therm			0.54
Proposed BGSS rate per therm			0.45
Approved CIP II revenues recovery		28
Approved SBC and NGC revenue recovery			400
Proposed Recovery of costs for Electric Green Energy Program					111
Proposed Recovery of costs for Gas Green Energy Programs					$ 18