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Fair Value Measurements (Changes in Level 3 Assets and (Liabilities) Measured at Fair Value on a Recurring Basis) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Gains and losses attributable to changes in net derivative assets and liabilities, included in Operating Income   $ (61)
Gains and losses attributable to changes in net derivative assets and liabilities, included in OCI 2 2
Gains and losses attributable to changes in net derivative assets and liabilities, included in Income from Discontinued Operations 3 23
Gains and losses attributable to changes in net derivative assets and liabilities, unrealized 9 (51)
Gains and losses attributable to changes in net derivative assets and liabilities, realized   (10)
Purchases 66  
Sales (36)  
Issuances (25)  
Settlements (12)  
Net Derivative Assets [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Opening Balance 47 105
Included in Income 22 [1] (36) [1]
Included in Regulatory Assets/Liabilities (8) [2] (1) [2]
Purchases, (Sales) 30 [3]  
Issuances (Settlements) (37) [4]  
Transfers In (Out) (33) [5]  
Purchases, (Sales) and Settlements   (21)
Closing Balance 21 47
NDT Funds [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Opening Balance 8 9
Included in Income 0 [1] 0 [1]
Included in Regulatory Assets/Liabilities 0 [2] 0 [2]
Purchases, (Sales) 0 [3]  
Issuances (Settlements) 0 [4]  
Transfers In (Out) (8) [5]  
Purchases, (Sales) and Settlements   (1)
Closing Balance 0 8
Non Recourse Debt [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Opening Balance 0  
Included in Income 0 [1]  
Included in Regulatory Assets/Liabilities 0 [2]  
Purchases, (Sales) 0 [3]  
Issuances (Settlements) (50) [4]  
Transfers In (Out) 0 [5]  
Closing Balance (50)  
Rabbi Trust Funds [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Opening Balance   14
Included in Income   0 [1]
Included in Regulatory Assets/Liabilities   0 [2]
Purchases, (Sales) and Settlements   (14)
Closing Balance   0
PSEG [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Gains and losses attributable to changes in net derivative assets and liabilities, included in Operating Income 17  
Power [Member]
   
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Gains and losses attributable to changes in net derivative assets and liabilities, realized $ 8  
[1] PSEG's and Power's gains and losses are mainly attributable to changes in net derivative assets and liabilities of which $17 million is included in Operating Income, $2 million is included in OCI, and $3 million is included in Income from Discontinued Operations. Of the $17 million in Operating Income, $9 million is unrealized and $8 million is realized.
[2] Mainly includes gains/losses on PSE&G's derivative contracts that are not included in either earnings or OCI, as they are deferred as a Regulatory Asset/Liability and are expected to be recovered from/returned to PSE&G's customers.
[3] Includes $66 million in purchases and $(36) million in sales.
[4] Includes $(25) million in issuances and $(12) million in settlements for derivative contracts and includes $(50) million of issuances due to initial recognition of lessor notes resulting from rejection of the Dynegy leveraged leases.
[5] During the year ended December 31, 2011, $8 million of assets in the NDT Fund were transferred from Level 3 to Level 2, due to more observable pricing for the underlying securities and $33 million of net derivative assets were transferred from Level 3 to Level 2 due to more available observable market data. The transfers were recognized as of the beginning of the first quarter and fourth quarter, respectively, (i.e. the quarters in which the transfers occurred), as per PSEG's policy.