Segment Reporting (Tables)

9 Months Ended

Sep. 30, 2019

Segment Reporting [Abstract]

Schedule of segment reporting information, by segment

	Three months ended September 30, 2019 (a)
	Retail		Generation		Corporate		Eliminations		Total
	(In millions)
Operating revenues(b)	$	2,544	$	974	$	—	$	(522)	$	2,996
Depreciation and amortization	37		47		7		—		91
Reorganization costs	1		—		—		—		1
(Loss)/gain on sale of assets	(1)		1		—		—		—
Equity in earnings of unconsolidated affiliates	—		29		—		—		29
Income/(loss) from continuing operations before income taxes	422		64		(107)		1		380
Income/(loss) from continuing operations	422		63		(112)		1		374
Loss from discontinued operations, net of tax	—		—		(2)		—		(2)
Net income/(loss)	422		63		(114)		1		372
Net income/(loss) attributable to NRG Energy, Inc.	$	422	$	63	$	(114)	$	1	$	372

(a) Includes intersegment revenues and costs associated with the internal transfer of power, which is based on average annualized market prices and results in higher revenues in Generation and higher cost of operations in Retail that are eliminated in consolidation
(b) Operating revenues include intersegment sales and net derivative gains and losses of:	$	1	$	513	$	8	$	—	$	522

	Three months ended September 30, 2018(a)
	Retail		Generation		Corporate		Eliminations		Total
	(In millions)
Operating revenues(b)	$	2,203	$	1,478	$	1	$	(722)	$	2,960
Depreciation and amortization	30		60		7		2		99
Reorganization costs	6		3		18		—		27
Equity in earnings of unconsolidated affiliates	—		20		3		(3)		20
Loss on debt extinguishment, net	—		—		(19)		—		(19)
(Loss)/income from continuing operations before income taxes	(128)		575		(145)		(7)		295
(Loss)/income from continuing operations	(128)		574		(152)		(7)		287
Loss from discontinued operations, net of tax	—		—		(336)		—		(336)
Net (loss)/income	(128)		574		(488)		(7)		(49)
Net (loss)/income attributable to NRG Energy, Inc.	$	(128)	$	559	$	(498)	$	(5)	$	(72)

(a) Includes intersegment revenues and costs associated with our internal transfer of power, which is based on average annualized market prices and results in higher revenues in Generation and higher cost of operations in Retail that are eliminated in consolidation
(b) Operating revenues include intersegment sales and net derivative gains and losses of:	$	1	$	739	$	(18)	$	—	$	722

	Nine months ended September 30, 2019 (a)
	Retail		Generation		Corporate		Eliminations		Total
	(In millions)
Operating revenues(b)	$	5,899	$	3,164	$	—	$	(1,437)	$	7,626
Depreciation and amortization	100		138		23		—		261
Impairment losses	1		—		—		—		1
Reorganization costs	4		1		11		—		16
(Loss)/gain on sale of assets	(1)		2		1		—		2
Equity in earnings of unconsolidated affiliates	—		8		—		—		8
Loss on debt extinguishment, net	—		—		(47)		—		(47)
Income/(loss) from continuing operations before income taxes	253		795		(382)		—		666
Income/(loss) from continuing operations	252		794		(389)		—		657
Income from discontinued operations, net of tax	—		—		399		—		399
Net income	252		794		10		—		1,056
Net income attributable to NRG Energy, Inc. common stockholders	$	251	$	794	$	10	$	—	$	1,055

(a) Includes intersegment revenues and costs associated with our internal transfer of power, which is based on average annualized market prices and results in higher revenues in Generation and higher cost of operations in Retail that are eliminated in consolidation
(b) Operating revenues include inter-segment sales and net derivative gains and losses of:	$	6	$	1,375	$	56	$	—	$	1,437

	Nine months ended September 30, 2018 (a)
	Retail		Generation		Corporate		Eliminations		Total
	(In millions)
Operating revenues(b)	$	5,497	$	2,916	$	—	$	(927)	$	7,486
Depreciation and amortization	86		220		25		—		331
Impairment losses	—		74		—		—		74
Reorganization costs	10		10		50		—		70
Gain on sale of assets	—		1		29		—		30
Equity in earnings of unconsolidated affiliates	—		27		4		(5)		26
Income/(loss) from continuing operations before income taxes	732		256		(412)		(4)		572
Income/(loss) from continuing operations	732		255		(430)		(4)		553
Loss from discontinued operations, net of tax	—		—		(272)		—		(272)
Net income/(loss)	732		255		(702)		(4)		281
Net income/(loss) attributable to NRG Energy, Inc. common stockholders	$	731	$	246	$	(697)	$	—	$	280

(a) Includes intersegment revenues and costs associated with our internal transfer of power, which is based on average annualized market prices and results in higher revenues in Generation and higher cost of operations in Retail that are eliminated in consolidation
(b) Operating revenues include inter-segment sales and net derivative gains and losses of:	$	7	$	944	$	(24)	$	—	$	927