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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
 [3]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance, beginning of period $ (127) $ (144)  
Amounts reclassified from AOCI to interest expense 1 2  
Net unrealized losses on foreign currency translation (4)    
Other comprehensive income (loss) related to equity method investee 4 1 [1]  
Total other comprehensive income, net of tax [2] 1 3 [1]  
Balance, end of period (126) (141)  
AOCI attributable to noncontrolling interest (127) (139)  
AOCI attributable to NextEra Energy Partners 1 (2) $ 1
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance, beginning of period 1 (4)  
Amounts reclassified from AOCI to interest expense 1 2  
Net unrealized losses on foreign currency translation 0    
Other comprehensive income (loss) related to equity method investee 0 0  
Total other comprehensive income, net of tax 1 2  
Balance, end of period 2 (2)  
AOCI attributable to noncontrolling interest 0 (3)  
AOCI attributable to NextEra Energy Partners 2 1  
Net Unrealized Gains (Losses) on Foreign Currency Translation [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance, beginning of period (98) (105)  
Amounts reclassified from AOCI to interest expense 0 0  
Net unrealized losses on foreign currency translation (4)    
Other comprehensive income (loss) related to equity method investee 0 0  
Total other comprehensive income, net of tax (4) 0  
Balance, end of period (102) (105)  
AOCI attributable to noncontrolling interest (99) (101)  
AOCI attributable to NextEra Energy Partners (3) (4)  
Other Comprehensive Income (Loss) Related to Equity Method Investee [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Balance, beginning of period (30) (35)  
Amounts reclassified from AOCI to interest expense 0 0  
Net unrealized losses on foreign currency translation 0    
Other comprehensive income (loss) related to equity method investee 4 1  
Total other comprehensive income, net of tax 4 1  
Balance, end of period (26) (34)  
AOCI attributable to noncontrolling interest (28) (35)  
AOCI attributable to NextEra Energy Partners $ 2 $ 1  
[1] Prior-period financial information has been retrospectively adjusted as discussed in Note 1.
[2] At March 31, 2018, approximately $6 million of preferred unit distributions were accrued and are payable in May 2018.
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