XML 48 R36.htm IDEA: XBRL DOCUMENT v3.8.0.1
Capitalization - (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Apr. 23, 2018
Mar. 31, 2018
Mar. 31, 2017
Numerator:      
Net income attributable to NEP – basic   $ 73 $ 12 [1]
Adjustments for convertible notes and preferred units   16  
Net income attributable to NEP used to compute diluted earnings per unit   $ 89  
Denominator:      
Weighted average number of common units outstanding - basic (in shares)   54,300,000 54,200,000 [1]
Convertible notes and preferred units (in shares)   19,700,000.0  
Weighted-average number of common units outstanding – assuming dilution (in shares)   74,000,000 54,200,000 [1]
Earnings per unit attributable to NEP:      
Basic (in shares)   $ 1.35 $ 0.22 [1]
Assuming dilution (in shares)   $ 1.21 $ 0.22
Subsequent Event [Member]      
Debt Instrument [Line Items]      
Distribution made to limited partner, distributions declared, per unit (in dollars per share) $ 0.42    
[1] Prior-period financial information has been retrospectively adjusted as discussed in Note 1.