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Financing Receivables (Outstanding Loans by Class of Customer) (Detail) - Public Service Electric and Gas Company [Member] - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Concentration Risk [Line Items] |  |
Average Loan Repayment Period | 8 years |
Outstanding Loans by Class of Customer | $ 118 | $ 121
Current Portion of Outstanding Loans | 30 | 29
Noncurrent Portion of Outstanding Loans | $ 88 | 92
Average Loan Remaining Repayment Period | 4 years |
Commercial/Industrial [Member] |  |
Concentration Risk [Line Items] |  |
Outstanding Loans by Class of Customer | $ 113 | 116
Residential [Member] |  |
Concentration Risk [Line Items] |  |
Outstanding Loans by Class of Customer | 5 | $ 5
Solar Loan I [Member] |  |
Concentration Risk [Line Items] |  |
Outstanding Loans by Class of Customer | $ 14 |
Solar Loan I [Member] | Commercial/Industrial [Member] |  |
Concentration Risk [Line Items] |  |
Loan Receivable, Term | 15 years |
Solar Loan I [Member] | Residential [Member] |  |
Concentration Risk [Line Items] |  |
Loan Receivable, Term | 10 years |
Solar Loan II [Member] |  |
Concentration Risk [Line Items] |  |
Outstanding Loans by Class of Customer | $ 55 |
Solar Loan II [Member] | Commercial/Industrial [Member] |  |
Concentration Risk [Line Items] |  |
Loan Receivable, Term | 15 years |
Solar Loan II [Member] | Residential [Member] |  |
Concentration Risk [Line Items] |  |
Loan Receivable, Term | 10 years |
Solar Loan III [Member] |  |
Concentration Risk [Line Items] |  |
Outstanding Loans by Class of Customer | $ 49 |
Solar Loan III [Member] | Commercial/Industrial [Member] |  |
Concentration Risk [Line Items] |  |
Loan Receivable, Term | 10 years |
Solar Loan III [Member] | Residential [Member] |  |
Concentration Risk [Line Items] |  |
Loan Receivable, Term | 10 years |
Minimum [Member] |  |
Concentration Risk [Line Items] |  |
Loan Receivable, Term | 10 years |
Maximum [Member] |  |
Concentration Risk [Line Items] |  |
Loan Receivable, Term | 15 years |

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