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Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Mar. 31, 2018
Equity [Abstract]  
Schedule of accumulated other comprehensive income (loss)
 
Accumulated Other Comprehensive Income (Loss)
 
Net Unrealized
Gains on
Cash Flow Hedges
 
Net Unrealized
Losses on
Foreign Currency
Translation
 
Other Comprehensive
Income (Loss) Related to
Equity Method Investee
 
Total
 
(millions)
Three months ended March 31, 2018
 
 
 
 
 
 
 
Balances, December 31, 2017
$
1

 
$
(98
)
 
$
(30
)
 
$
(127
)
Amounts reclassified from AOCI to interest expense
1

 
—

 
—

 
1

Net unrealized losses on foreign currency translation
—

 
(4
)
 
—

 
(4
)
Other comprehensive income related to equity method investee
—

 
—

 
4

 
4

Net other comprehensive income (loss)
1

 
(4
)
 
4

 
1

Balances, March 31, 2018
$
2

 
$
(102
)
 
$
(26
)
 
$
(126
)
AOCI attributable to noncontrolling interest
$
—

 
$
(99
)
 
$
(28
)
 
$
(127
)
AOCI attributable to NEP
$
2

 
$
(3
)
 
$
2

 
$
1


 
 
 
 
 
 
 
 
 
Accumulated Other Comprehensive Income (Loss)
 
Net Unrealized
Gains (Losses) on
Cash Flow Hedges
 
Net Unrealized
Losses on
Foreign Currency
Translation
 
Other Comprehensive
Income (Loss) Related to
Equity Method Investee
 
Total
 
(millions)
Three months ended March 31, 2017
 
 
 
 
 
 
 
Balances, December 31, 2016
$
(4
)
 
$
(105
)
 
$
(35
)
 
$
(144
)
Amounts reclassified from AOCI to interest expense
2

 
—

 
—

 
2

Other comprehensive income related to equity method investee
—

 
—

 
1

 
1

Net other comprehensive income
2

 
—

 
1

 
3

Balances, March 31, 2017
$
(2
)
 
$
(105
)
 
$
(34
)
 
$
(141
)
AOCI attributable to noncontrolling interest
$
(3
)
 
$
(101
)
 
$
(35
)
 
$
(139
)
AOCI attributable to NEP
$
1

 
$
(4
)
 
$
1

 
$
(2
)