Income Taxes (Unrecognized Tax Benefits) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Total Amount of Unrecognized Tax Benefits at January	$ 478us-gaap_UnrecognizedTaxBenefits	$ 402us-gaap_UnrecognizedTaxBenefits	$ 825us-gaap_UnrecognizedTaxBenefits
Increases as a Result of Positions Taken in a Prior Period	82	83	92
Decreases as a Result of Positions Taken in a Prior Period	(190)	(30)	(173)
Increases as a Result of Positions Taken during the Current Period	30	23	47
Decreases as a Result of Positions Taken during the Current Period	(8)	0	0
Decreases as a Result of Settlements with Taxing Authorities	(60)	0	(389)
Decreases due to Lapses of Applicable Statute of Limitations	0	0	0
Total Amount of Unrecognized Tax Benefits at December	332us-gaap_UnrecognizedTaxBenefits	478us-gaap_UnrecognizedTaxBenefits	402us-gaap_UnrecognizedTaxBenefits
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits	(225)	(320)	(264)
Regulatory Asset-Unrecognized Tax Benefits	(27)	(30)	(30)
Amount of unrecognized tax benefits that would affect the effective tax rate	80	128	108
Power [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Total Amount of Unrecognized Tax Benefits at January	156	134	121
Increases as a Result of Positions Taken in a Prior Period	17	33	27
Decreases as a Result of Positions Taken in a Prior Period	(80)	(19)	(7)
Increases as a Result of Positions Taken during the Current Period	9	8	3
Decreases as a Result of Positions Taken during the Current Period	(8)	0	0
Decreases as a Result of Settlements with Taxing Authorities	(24)	0	(10)
Decreases due to Lapses of Applicable Statute of Limitations	0	0	0
Total Amount of Unrecognized Tax Benefits at December	70	156	134
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits	(52)	(105)	(93)
Regulatory Asset-Unrecognized Tax Benefits	0	0	0
Amount of unrecognized tax benefits that would affect the effective tax rate	18	51	41
PSE&G [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Total Amount of Unrecognized Tax Benefits at January	208	163	113
Increases as a Result of Positions Taken in a Prior Period	65	39	55
Decreases as a Result of Positions Taken in a Prior Period	(92)	(9)	(47)
Increases as a Result of Positions Taken during the Current Period	16	15	42
Decreases as a Result of Positions Taken during the Current Period	0	0	0
Decreases as a Result of Settlements with Taxing Authorities	(32)	0	0
Decreases due to Lapses of Applicable Statute of Limitations	0	0	0
Total Amount of Unrecognized Tax Benefits at December	165	208	163
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits	(138)	(177)	(133)
Regulatory Asset-Unrecognized Tax Benefits	(27)	(30)	(30)
Amount of unrecognized tax benefits that would affect the effective tax rate	0	1	0
Energy Holdings [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Total Amount of Unrecognized Tax Benefits at January	110	101	555
Increases as a Result of Positions Taken in a Prior Period	0	11	9
Decreases as a Result of Positions Taken in a Prior Period	(18)	(2)	(119)
Increases as a Result of Positions Taken during the Current Period	5	0	0
Decreases as a Result of Positions Taken during the Current Period	0	0	0
Decreases as a Result of Settlements with Taxing Authorities	(2)	0	(344)
Decreases due to Lapses of Applicable Statute of Limitations	0	0	0
Total Amount of Unrecognized Tax Benefits at December	95	110	101
Accumulated Deferred Income Taxes Associated with Unrecognized Tax Benefits	(35)	(37)	(35)
Regulatory Asset-Unrecognized Tax Benefits	0	0	0
Amount of unrecognized tax benefits that would affect the effective tax rate	$ 60	$ 73	$ 66

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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