Accumulated Other Comprehensive Income (Loss)

9 Months Ended

Sep. 30, 2017

Equity [Abstract]

Accumulated Other Comprehensive (Income) Loss

Accumulated Other Comprehensive Income (Loss)

	Accumulated Other Comprehensive Income (Loss)
	Net Unrealized Gains (Losses) on Cash Flow Hedges			Net Unrealized Gains (Losses) on Foreign Currency Translation			Other Comprehensive Income (Loss) Related to Equity Method Investee			Total
	(millions)
Three months ended September 30, 2017
Balances, June 30, 2017	$	(1	)	$	(102	)	$	(15	)	$	(118	)
Amounts reclassified from AOCI to interest expense	1			—			—			1
Net unrealized gains on foreign currency translation	—			5			—			5
Net other comprehensive income	1			5			—			6
Balances, September 30, 2017	$	—		$	(97	)	$	(15	)	$	(112	)
AOCI attributable to noncontrolling interest	$	(1	)	$	(95	)	$	(16	)	$	(112	)
AOCI attributable to NEP	$	1		$	(2	)	$	1		$	—

	Accumulated Other Comprehensive Income (Loss)
	Net Unrealized Gains (Losses) on Cash Flow Hedges			Net Unrealized Gains (Losses) on Foreign Currency Translation			Other Comprehensive Income (Loss) Related to Equity Method Investee			Total
	(millions)
Nine months ended September 30, 2017
Balances, December 31, 2016	$	(4	)	$	(105	)	$	(16	)	$	(125	)
Amounts reclassified from AOCI to interest expense	4			—			—			4
Net unrealized gains on foreign currency translation	—			8			—			8
Other comprehensive income related to equity method investee	—			—			1			1
Net other comprehensive income	4			8			1			13
Balances, September 30, 2017	$	—		$	(97	)	$	(15	)	$	(112	)
AOCI attributable to noncontrolling interest	$	(1	)	$	(95	)	$	(16	)	$	(112	)
AOCI attributable to NEP	$	1		$	(2	)	$	1		$	—

	Accumulated Other Comprehensive 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 September 30, 2016
Balances, June 30, 2016	$	(8	)	$	(101	)	$	(20	)	$	(129	)
Amounts reclassified from AOCI to interest expense	2			—			—			2
Net unrealized losses on foreign currency translation	—			(1		)	—			(1		)
Other comprehensive income related to equity method investee	—			—			1			1
Net other comprehensive income (loss)	2			(1		)	1			2
Balances, September 30, 2016	$	(6	)	$	(102	)	$	(19	)	$	(127	)
AOCI attributable to noncontrolling interest	$	(6	)	$	(98	)	$	(19	)	$	(123	)
AOCI attributable to NEP	$	—		$	(4	)	$	—		$	(4	)

	Accumulated Other Comprehensive Loss
	Net Unrealized Gains (Losses) on Cash Flow Hedges			Net Unrealized Gains (Losses) on Foreign Currency Translation			Other Comprehensive Loss Related to Equity Method Investee			Total
	(millions)
Nine months ended September 30, 2016
Balances, December 31, 2015	$	(11	)	$	(108	)	$	(18	)	$	(137	)
Amounts reclassified from AOCI to interest expense	5			—			—			5
Net unrealized gains on foreign currency translation	—			6			—			6
Other comprehensive loss related to equity method investee	—			—			(1		)	(1		)
Net other comprehensive income (loss)	5			6			(1		)	10
Balances, September 30, 2016	$	(6	)	$	(102	)	$	(19	)	$	(127	)
AOCI attributable to noncontrolling interest	$	(6	)	$	(98	)	$	(19	)	$	(123	)
AOCI attributable to NEP	$	—		$	(4	)	$	—		$	(4	)