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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2020
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, 2020December 31, 2019
Level 1
Level 2TotalLevel 1Level 2Total
(millions)
Assets:
Cash equivalents
$3 $— $3 $16 $— $16 
Interest rate contracts
— 53 53 — 99
Total assets
$3 $53 $56 $16 $9 $25 
Liabilities:
Interest rate contracts
$— $1,073 $1,073 $— $427 $427 
Total liabilities
$— $1,073 $1,073 $— $427 $427 
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, 2020December 31, 2019
Carrying
Value		Fair
Value		Carrying
Value		Fair
Value
(millions)
Long-term debt, including current maturities(a)
$3,903 $4,016 $4,144 $4,235 
____________________
(a)    At September 30, 2020 and December 31, 2019, approximately $3,990 million and $4,211 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).