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Capitalization - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Numerator:        
Net income attributable to NEP – basic $ (72) $ 33 [1] $ (122) $ 189 [1]
Adjustments for convertible notes and preferred units   10   52
Net income attributable to NEP – assuming dilution   $ 43   $ 241
Denominator:        
Weighted average number of common units outstanding - basic (in shares) 59.9 54.9 [1] 57.4 54.5 [1]
Convertible notes and preferred units (in shares)   19.7   19.7
Weighted-average number of common units outstanding – assuming dilution (in shares) 75.8 74.6 [1] 75.8 74.2 [1]
Earnings per unit attributable to NEP:        
Basic (in shares) $ (1.21) $ 0.60 [1] $ (2.12) $ 3.47 [1]
Assuming dilution (in shares) $ (1.21) $ 0.58 [1] $ (2.12) $ 3.25 [1]
[1]
Prior-period financial information has been retrospectively adjusted to include the adoption of an accounting standards update related to leases.