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Accumulated Other Comprehensive Income (Loss)
 9 Months Ended
Sep. 30, 2019
Equity [Abstract]  
Accumulated Other Comprehensive (Income) Loss Accumulated Other Comprehensive Income (Loss)
 
Accumulated Other Comprehensive Income (Loss)
 
Net Unrealized
Gains on
Cash Flow Hedges
 
Other Comprehensive
Income (Loss) Related to
Equity Method Investees
 
Total
 
(millions)
 
 
 
 
 
 
Balances, December 31, 2018
$
6

 
$
(24
)
 
$
(18
)
Amounts reclassified from AOCI to interest expense
(6
)
 
—

 
(6
)
Other comprehensive income related to equity method investees
—

 
1

 
1

Net other comprehensive income (loss)
(6
)
 
1

 
(5
)
Balances, March 31, 2019
—

 
(23
)
 
(23
)
Net other comprehensive income (loss)
—

 
—

 
—

Balances, June 30, 2019
—

 
(23
)
 
(23
)
Net other comprehensive income (loss)
—

 
—

 
—

Balances, September 30, 2019
$
—

 
$
(23
)
 
$
(23
)
AOCI attributable to noncontrolling interest
$
—

 
$
(15
)
 
$
(15
)
AOCI attributable to NEP
$
—

 
$
(8
)
 
$
(8
)
 
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)
 
 
 
 
 
 
 
 
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
)
Amounts reclassified from AOCI to interest expense
1

 
—

 
—

 
1

Net unrealized losses on foreign currency translation
—

 
(2
)
 
—

 
(2
)
Other comprehensive income related to equity method investee
—

 
—

 
(4
)
 
(4
)
Net other comprehensive income (loss)
1

 
(2
)
 
(4
)
 
(5
)
Impact of disposal of Canadian Holdings
3

 
104

 
—

 
107

Balances, June 30, 2018
6

 
—

 
(30
)
 
(24
)
Amounts reclassified from AOCI to interest expense
(1
)
 
—

 
—

 
(1
)
Other comprehensive income related to equity method investee
—

 
—

 
9

 
9

Net other comprehensive income (loss)
(1
)
 
—

 
9

 
8

Balances, September 30, 2018
$
5

 
$
—

 
$
(21
)
 
$
(16
)
AOCI attributable to noncontrolling interest
$
4

 
$
—

 
$
(15
)
 
$
(11
)
AOCI attributable to NEP
$
1

 
$
—

 
$
(6
)
 
$
(5
)