Fair Value Measurements (Changes In Level 3 Assets And (Liabilities) Measured At Fair Value On A Recurring Basis) (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | 12 Months Ended | |||||||||||||||||
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Jun. 30, 2013
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Jun. 30, 2012
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Jun. 30, 2013
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Jun. 30, 2012
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Dec. 31, 2011
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||||||||||||
Gains and losses attributable to changes in net derivative assets and liabilities, included in Operating Income | $ (17) | |||||||||||||||||||
Gains and losses attributable to changes in net derivative assets and liabilities, unrealized | (8) | (2) | ||||||||||||||||||
Settlements | (14) | 10 | (43) | |||||||||||||||||
Power [Member]
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||||||||||||
Gains and losses attributable to changes in net derivative assets and liabilities, included in Operating Income | 17 | 7 | 41 | |||||||||||||||||
Gains and losses attributable to changes in net derivative assets and liabilities, unrealized | 16 | (7) | ||||||||||||||||||
Derivative [Member] | Power [Member]
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||||||||||||
Transfers In (Out) | (6) | (4) | ||||||||||||||||||
Net Derivative Assets (Liabilities) [Member] | PSEG [Member]
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||||||||||||
Opening Balance | 57 | (61) | 31 | (21) | ||||||||||||||||
Included in Income | 17 | [1] | (7) | [1] | (17) | [2] | 41 | [2] | ||||||||||||
Included in Regulatory Assets/Liabilities | (1) | [3] | (90) | [3] | (55) | [3] | ||||||||||||||
Purchases, (Sales) | 0 | 0 | 0 | 0 | ||||||||||||||||
Issuances (Settlements) | 0 | [4] | 14 | [4] | 10 | [4] | (43) | [4] | ||||||||||||
Transfers In (Out) | 6 | [5] | 0 | [5] | 4 | [5] | 0 | [5] | ||||||||||||
Closing Balance | 35 | 36 | 35 | 36 | ||||||||||||||||
Net Derivative Assets (Liabilities) [Member] | Power [Member]
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||||||||||||
Opening Balance | 17 | (29) | (9) | (24) | ||||||||||||||||
Included in Income | 17 | [1] | (7) | [1] | (17) | [2] | 41 | [2] | ||||||||||||
Included in Regulatory Assets/Liabilities | 0 | [3] | 0 | [3] | 0 | [3] | 0 | [3] | ||||||||||||
Purchases, (Sales) | 0 | 0 | 0 | 0 | ||||||||||||||||
Issuances (Settlements) | 0 | [4] | 14 | [4] | 10 | [4] | (43) | [4] | ||||||||||||
Transfers In (Out) | 6 | [5] | 0 | [5] | 4 | [5] | 0 | [5] | ||||||||||||
Closing Balance | (6) | (22) | (6) | (22) | ||||||||||||||||
Net Derivative Assets (Liabilities) [Member] | PSE And G [Member]
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||||||||||||
Opening Balance | 40 | (32) | 40 | 3 | ||||||||||||||||
Included in Income | 0 | [1] | 0 | [1] | 0 | [2] | 0 | [2] | ||||||||||||
Included in Regulatory Assets/Liabilities | (1) | [3] | (90) | [3] | (1) | [3] | (55) | [3] | ||||||||||||
Purchases, (Sales) | 0 | 0 | 0 | 0 | ||||||||||||||||
Issuances (Settlements) | 0 | [4] | 0 | [4] | 0 | [4] | 0 | [4] | ||||||||||||
Transfers In (Out) | 0 | [5] | 0 | [5] | 0 | [5] | 0 | [5] | ||||||||||||
Closing Balance | 41 | 58 | 41 | 58 | 3 | |||||||||||||||
Non Recourse Debt [Member] | PSEG [Member]
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||||||||||||||||||||
Opening Balance | 50 | 50 | ||||||||||||||||||
Included in Income | 50 | [1] | 50 | [2] | ||||||||||||||||
Included in Regulatory Assets/Liabilities | 0 | [3] | 0 | [3] | ||||||||||||||||
Purchases, (Sales) | 0 | 0 | ||||||||||||||||||
Issuances (Settlements) | 0 | [4] | 0 | [4] | ||||||||||||||||
Transfers In (Out) | 0 | [5] | 0 | [5] | ||||||||||||||||
Closing Balance | $ 0 | $ 0 | ||||||||||||||||||
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