Condensed Consolidated Statements of Changes in Equity		USD ($) shares	Series A Convertible Preferred Units [Member] USD ($) shares	Common Stock [Member] shares	Preferred Units [Member] shares	Preferred Partner [Member] USD ($)	Units [Member] USD ($) shares	Limited Partners [Member] USD ($)	Accumulated Other Comprehensive Income (Loss) [Member] USD ($)	Non-controlling Interests [Member] USD ($)	Common Stock [Member] $ / shares
Beginning balance, units at Dec. 31, 2018 | shares					14,000,000.0		56,100,000
Beginning balance at Dec. 31, 2018		$ 5,538,000,000				$ 548,000,000		$ 1,804,000,000	$ (6,000,000)	$ 3,192,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common units (in units) | shares							100,000
Issuance of common units - net(b)		1,000,000						1,000,000
Net income (loss)		(121,000,000)				6,000,000		(22,000,000)		(105,000,000)
Other comprehensive income (loss)		(5,000,000)							(2,000,000)	(3,000,000)
Related party contributions		1,000,000								1,000,000
Related party distributions		(51,000,000)								(51,000,000)
Other differential membership investment activity		24,000,000								24,000,000
Changes in non-economic ownership interests		(6,000,000)								(6,000,000)
Payments to Class B noncontrolling interest investors		(5,000,000)								(5,000,000)
Distributions to unitholders	[1]	(32,000,000)				(6,000,000)		(26,000,000)
Other		1,000,000								1,000,000
Ending balance, units at Mar. 31, 2019 | shares					14,000,000.0		56,200,000
Ending balance at Mar. 31, 2019		5,345,000,000				548,000,000		1,757,000,000	(8,000,000)	3,048,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Distributions per common unit (usd per share) | $ / shares											$ 0.4650
Beginning balance, units at Dec. 31, 2018 | shares					14,000,000.0		56,100,000
Beginning balance at Dec. 31, 2018		5,538,000,000				548,000,000		1,804,000,000	(6,000,000)	3,192,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(488,000,000)
Other comprehensive income (loss)		(5,000,000)
Ending balance, units at Sep. 30, 2019 | shares					9,300,000		60,800,000
Ending balance at Sep. 30, 2019		6,176,000,000				365,000,000		1,803,000,000	(8,000,000)	4,016,000,000
Beginning balance, units at Mar. 31, 2019 | shares					14,000,000.0		56,200,000
Beginning balance at Mar. 31, 2019		5,345,000,000				548,000,000		1,757,000,000	(8,000,000)	3,048,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common units - net(b)		1,000,000						1,000,000
Acquisition of subsidiary with noncontrolling ownership interests		472,000,000								472,000,000
Net income (loss)		(124,000,000)				6,000,000		(28,000,000)		(102,000,000)
Other comprehensive income (loss)		0
Related party note receivable		1,000,000								1,000,000
Related party contributions		11,000,000								11,000,000
Related party distributions		(56,000,000)								(56,000,000)
Other differential membership investment activity		(8,000,000)								(8,000,000)
Payments to Class B noncontrolling interest investors		(3,000,000)								(3,000,000)
Distributions to unitholders	[1]	(33,000,000)				(6,000,000)		(27,000,000)
Sale of Class B noncontrolling interest - net		893,000,000								893,000,000
Other		1,000,000						1,000,000
Ending balance, units at Jun. 30, 2019 | shares					14,000,000.0		56,200,000
Ending balance at Jun. 30, 2019		6,500,000,000				548,000,000		1,704,000,000	(8,000,000)	4,256,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Distributions per common unit (usd per share) | $ / shares											0.4825
Issuance of common units (in units) | shares	[2]				4,700,000		4,700,000
Issuance of common units - net(b)	[2]	20,000,000				(183,000,000)		203,000,000
Acquisition of subsidiary with noncontrolling ownership interests		11,000,000						1,000,000		10,000,000
Net income (loss)		(243,000,000)				2,000,000		(72,000,000)		(173,000,000)
Other comprehensive income (loss)		0
Related party distributions		(71,000,000)								(71,000,000)
Other differential membership investment activity		27,000,000								27,000,000
Changes in non-economic ownership interests		(6,000,000)								(6,000,000)
Payments to Class B noncontrolling interest investors		(7,000,000)								(7,000,000)
Distributions to unitholders	[1]	(33,000,000)				(2,000,000)		(31,000,000)
Other		0					$ (100,000)	0
Ending balance, units at Sep. 30, 2019 | shares					9,300,000		60,800,000
Ending balance at Sep. 30, 2019		$ 6,176,000,000				365,000,000		1,803,000,000	(8,000,000)	4,016,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Distributions per common unit (usd per share) | $ / shares											0.5025
Conversion of stock, shares converted (in shares) | shares			4,670,000
Conversion ratio			1
Deferred tax asset			$ 20,000,000
Beginning balance, units at Dec. 31, 2019 | shares		65,500,000			4,700,000		65,500,000
Beginning balance at Dec. 31, 2019		$ 7,066,000,000				183,000,000		2,008,000,000	(8,000,000)	4,883,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(720,000,000)				2,000,000		(222,000,000)		(500,000,000)
Other comprehensive income (loss)		0
Related party contributions		3,000,000								3,000,000
Related party distributions		(62,000,000)								(62,000,000)
Other differential membership investment activity		40,000,000								40,000,000
Payments to Class B noncontrolling interest investors		(10,000,000)								(10,000,000)
Distributions to unitholders	[3]	(37,000,000)				(2,000,000)		(35,000,000)
Other		(1,000,000)						(1,000,000)		0
Ending balance, units at Mar. 31, 2020 | shares					4,700,000		65,500,000
Ending balance at Mar. 31, 2020		$ 6,279,000,000				183,000,000		1,750,000,000	(8,000,000)	4,354,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Distributions per common unit (usd per share) | $ / shares											0.5350
Beginning balance, units at Dec. 31, 2019 | shares		65,500,000			4,700,000		65,500,000
Beginning balance at Dec. 31, 2019		$ 7,066,000,000				183,000,000		2,008,000,000	(8,000,000)	4,883,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(398,000,000)
Other comprehensive income (loss)		$ 1,000,000
Ending balance, units at Sep. 30, 2020 | shares		73,000,000.0			2,900,000		73,000,000.0
Ending balance at Sep. 30, 2020		$ 6,723,000,000				112,000,000		2,194,000,000	(8,000,000)	4,425,000,000
Beginning balance, units at Mar. 31, 2020 | shares					4,700,000		65,500,000
Beginning balance at Mar. 31, 2020		6,279,000,000				183,000,000		1,750,000,000	(8,000,000)	4,354,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		127,000,000				2,000,000		47,000,000		78,000,000
Other comprehensive income (loss)		1,000,000								1,000,000
Related party note receivable		1,000,000								1,000,000
Related party contributions		2,000,000								2,000,000
Related party distributions		(69,000,000)								(69,000,000)
Other differential membership investment activity		(8,000,000)								(8,000,000)
Payments to Class B noncontrolling interest investors		(11,000,000)								(11,000,000)
Distributions to unitholders	[3]	(38,000,000)				(2,000,000)		(36,000,000)
Other		(1,000,000)						(2,000,000)		1,000,000
Ending balance, units at Jun. 30, 2020 | shares					4,700,000		65,500,000
Ending balance at Jun. 30, 2020		6,283,000,000				183,000,000		1,759,000,000	(8,000,000)	4,349,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Distributions per common unit (usd per share) | $ / shares											0.5550
Issuance of common units (in units) | shares	[4]				1,800,000		7,500,000
Issuance of common units - net(b)	[4]	347,000,000				(71,000,000)		418,000,000
Net income (loss)		195,000,000				1,000,000		56,000,000		138,000,000
Other comprehensive income (loss)		0
Related party contributions		1,000,000								1,000,000
Related party distributions		(81,000,000)								(81,000,000)
Other differential membership investment activity		39,000,000								39,000,000
Changes in non-economic ownership interests		(7,000,000)								(7,000,000)
Payments to Class B noncontrolling interest investors		(13,000,000)								(13,000,000)
Distributions to unitholders	[3]	(40,000,000)				(1,000,000)		(39,000,000)
Other		$ (1,000,000)						0		(1,000,000)
Ending balance, units at Sep. 30, 2020 | shares		73,000,000.0			2,900,000		73,000,000.0
Ending balance at Sep. 30, 2020		$ 6,723,000,000				$ 112,000,000		$ 2,194,000,000	$ (8,000,000)	$ 4,425,000,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Distributions per common unit (usd per share) | $ / shares											$ 0.5775
Conversion of stock, shares converted (in shares) | shares			1,800,000	5,700,000
Conversion ratio			1
Deferred tax asset		47,000,000
Convertible notes		$ 300,000,000

[1] Distributions per common unit of $0.5025, $0.4825 and $0.4650 were paid during the three months ended September 30, 2019, June 30, 2019 and March 31, 2019, respectively.

[2] During the three months ended September 30, 2019, NEP converted approximately 4.67 million preferred units into NEP common units on a one-for-one basis and recognized a deferred tax asset of $20 million related to the issuance of NEP common units.

[3] Distributions per common unit of $0.5775, $0.5550 and $0.5350 were paid during the three months ended September 30, 2020, June 30, 2020 and March 31, 2020, respectively. At September 30, 2020, $1 million of preferred unit distributions were accrued and are payable in November 2020.

[4] .During the three months ended September 30, 2020, NEP issued 1.8 million NEP common units upon the conversion of preferred units on a one-for-one basis and issued approximately 5.7 million NEP common units upon the conversion of $300 million of convertible notes (see Note 7 - Equity). NEP recognized a deferred tax asset of $47 million related to the issuance of NEP common units.