Related-Party Transactions (Schedule Of Related Party Transactions, Receivables) (Detail) - Power [Member] - USD ($) $ in Millions |
Mar. 31, 2018 |
Dec. 31, 2017 |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Related Party Transaction [Line Items] | |||||||||||||
| Receivable from PSE&G | [1] | $ 215 | $ 221 | ||||||||||
| Accounts Receivable, Affiliated Companies | 215 | 221 | |||||||||||
| Payable To Services | [2] | 23 | 28 | ||||||||||
| Payable to PSEG | [3] | 46 | 29 | ||||||||||
| Accounts Payable - Affiliated Companies | 69 | 57 | |||||||||||
| Short-Term Loan from Affiliate | [4] | 35 | 281 | ||||||||||
| Working Capital Advances to Services | [5] | 17 | 17 | ||||||||||
| Long-Term Accrued Taxes Payable | $ 46 | $ 52 | |||||||||||
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