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Earnings Per Share (EPS) And Dividends (Basic And Diluted Earnings Per Share Computation) (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Disclosure Earnings Per Share E P S And Dividends Basic And Diluted Earnings Per Share Computation [Abstract] |  |
Net Income | $ 586 us-gaap_NetIncomeLoss | $ 386 us-gaap_NetIncomeLoss
Weighted Average Common Shares Outstanding, Basic | 506 pseg_WeightedAverageCommonSharesOutstandingBeforeVariousEffectsBasic | 506 pseg_WeightedAverageCommonSharesOutstandingBeforeVariousEffectsBasic
Effect of Stock Based Compensation Awards, Basic | 0 pseg_IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsBasic | 0 pseg_IncrementalCommonSharesAttributableToShareBasedPaymentArrangementsBasic
Total Shares, Basic | 506 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 506 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Net Income, Basic | $ 1.16 us-gaap_EarningsPerShareBasic | $ 0.76 us-gaap_EarningsPerShareBasic
Weighted Average Common Shares Outstanding, Diluted | 506 pseg_WeightedAverageCommonSharesOutstandingBeforeVariousEffectsDiluted | 506 pseg_WeightedAverageCommonSharesOutstandingBeforeVariousEffectsDiluted
Effect of Stock Based Compensation Awards, Diluted | 2 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 2 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Total Shares, Diluted | 508 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 508 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net Income, Diluted | $ 1.15 us-gaap_EarningsPerShareDiluted | $ 0.76 us-gaap_EarningsPerShareDiluted

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