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Non-Derivative Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2023
Fair Value Disclosures [Abstract]  
Schedule of financial assets and liabilities and other fair value measurements on a recurring basis NEP’s financial assets and liabilities and other fair value measurements made on a recurring basis by fair value hierarchy level are as follows:
September 30, 2023December 31, 2022
Level 1Level 2TotalLevel 1Level 2Total
(millions)
Assets:
Cash equivalents
$— $— $— $5 $— $5 
Total assets$— $— $— $5 $— $5 
Schedule of other financial instrument, carrying amounts and estimated fair values The carrying amounts and estimated fair values of other financial instruments recorded at other than fair value are as follows:
September 30, 2023December 31, 2022
Carrying
Value		Fair
Value		Carrying
Value		Fair
Value
(millions)
Long-term debt, including current maturities(a)
$6,481 $6,171 $5,288 $5,105 
____________________
(a)    At September 30, 2023 and December 31, 2022, approximately $6,152 million and $5,086 million, respectively, of the fair value is estimated using a market approach based on quoted market prices for the same or similar issues (Level 2); the balance is estimated using an income approach utilizing a discounted cash flow valuation technique, considering the current credit profile of the debtor (Level 3). At September 30, 2023 and December 31, 2022, approximately $1,391 million and $1,510 million, respectively, of the fair value relates to the 2020 convertible notes, the 2021 convertible notes and the 2022 convertible notes and is estimated using Level 2 inputs.