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Equity - Basic and Diluted Earnings Per Unit (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Numerator:        
Numerator – Net income attributable to NEP $ 53 $ 79 $ 88 $ 443
Denominator:        
Weighted-average number of common units outstanding – basic (in shares) 93.4 85.1 91.0 84.3
Convertible notes and preferred units (in shares) 0.0 0.5 0.0 0.1
Weighted-average number of common units outstanding – assuming dilution (in shares) 93.4 85.6 91.0 84.4
Earnings per unit attributable to NEP:        
Basic (in shares) $ 0.57 $ 0.93 $ 0.96 $ 5.25
Assuming dilution (in shares) $ 0.57 $ 0.93 $ 0.96 $ 5.25