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Condensed Consolidating Financial Information - Statements of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Flows from Operating Activities
Net (Loss)/Income	$ (13)	$ (48)	$ 96	$ 233	$ (1,655)	$ 163	$ (642)	$ (203)	$ 268	$ (2,337)	$ (891)
(Loss)/income from discontinued operations, net of income tax	80	(336)	69	(5)	(265)	0	(702)	(25)	(192)	(992)	65
Net Income/(Loss) from Continuing Operations	(93)	$ 288	$ 27	238	(1,390)	$ 163	$ 60	(178)	460	(1,345)	(956)
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Distributions and equity in earnings of unconsolidated affiliates									46	102	67
Depreciation, amortization and accretion									459	596	772
Provision for bad debts									85	68	45
Amortization of nuclear fuel									48	51	49
Amortization of financing costs and debt discount/premiums									29	29	33
Adjustment for debt extinguishment									44	49	142
Amortization of intangibles and out-of-market contracts									45	54	68
Amortization of unearned equity compensation									25	35	10
Net (gain)/loss on sale of assets and equity/cost method investments									(49)	(9)	139
Impairment losses									114	1,614	751
Changes in derivative instruments									37	(170)	16
Changes in deferred income taxes and liability for uncertain tax benefits									5	13	(12)
Changes in collateral deposits in support of risk management activities									(105)	(80)	396
Changes in nuclear decommissioning trust liability									60	11	41
GenOn settlement, net of insurance proceeds									(63)	0	0
Net loss on deconsolidation of Agua Caliente and Ivanpah projects									13	0	0
Changes in other working capital									(250)	(162)	(124)
Cash provided/(used) by continuing operations									1,003	856	1,437
Cash provided by discontinued operations									374	754	471
Net Cash Provided by Operating Activities									1,377	1,610	1,908
Cash Flows from Investing Activities
Acquisition of businesses, net of cash acquired									(243)	(14)	0
Capital expenditures									(388)	(254)	(544)
Proceeds from renewable energy grants									0	8	36
Net proceeds from sale/(purchases) of emission allowances									19	66	(1)
Net proceeds from sale of emission allowances										(66)	(1)
Investments in nuclear decommissioning trust fund securities									(572)	(512)	(551)
Proceeds from sales of nuclear decommissioning trust fund securities									513	501	510
Proceeds from sale of assets, net of cash disposed and sale of discontinued operations, net of fees									1,564	430	241
Deconsolidation of Agua Caliente and Ivanpah projects									(268)	0	0
Changes in investments in unconsolidated affiliates									(39)	(57)	(33)
Net (contributions to)/distributions from discontinued operations									(60)	150	(58)
Other									(6)	22	31
Cash provided/(used) by continuing operations									520	340	(369)
Cash used by discontinued operations									(725)	(979)	(388)
Net Cash Used by Investing Activities									(205)	(639)	(757)
Cash Flows from Financing Activities
Payments (for)/from intercompany loans									0	0	0
Payments of dividends to preferred and common stockholders									(37)	(38)	(76)
Payment for preferred shares									(1,250)
Payments for preferred shares									0	0	(226)
Payments for debt extinguishment costs									(32)	(42)	(121)
Net distributions to noncontrolling interests from subsidiaries									(16)	(30)	(27)
Proceeds/(payments) from issuance of common stock									21	(2)	1
Proceeds from issuance of long-term debt									1,100	1,178	4,412
Payments of debt issuance costs									(19)	(18)	(61)
Payments for short and long-term debt									(1,734)	(1,884)	(5,146)
Receivable from affiliate										(125)
Receivable from affiliate									(26)	(125)	0
Other									(4)	(8)	(7)
Cash used by continuing operations									(1,997)	(969)	(1,251)
Cash provided/(used) by discontinued operations									471	(169)	483
Net Cash (Used)/Provided by Financing Activities									(1,526)	(1,138)	(768)
Effect of exchange rate changes on cash and cash equivalents									1	(1)	1
Change in Cash from discontinued operations									120	(394)	566
Net (Decrease)/Increase in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash									(473)	226	(182)
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period	613				1,086				613	1,086	860
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period				1,086				860	1,086	860	1,042
Eliminations
Cash Flows from Operating Activities
Net (Loss)/Income									(1,239)	(46)	(328)
(Loss)/income from discontinued operations, net of income tax									0	0	0
Net Income/(Loss) from Continuing Operations									(1,239)	(46)	(328)
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Distributions and equity in earnings of unconsolidated affiliates									0	0	0
Depreciation, amortization and accretion									0	0	0
Provision for bad debts									0	0	0
Amortization of nuclear fuel									0	0	0
Amortization of financing costs and debt discount/premiums									0	0	0
Adjustment for debt extinguishment									0	0	0
Amortization of intangibles and out-of-market contracts									0	0	0
Amortization of unearned equity compensation									0	0	0
Net (gain)/loss on sale of assets and equity/cost method investments									0	0	0
Impairment losses									0	0	0
Changes in derivative instruments									(14)	(2)	3
Changes in deferred income taxes and liability for uncertain tax benefits									0	0	0
Changes in collateral deposits in support of risk management activities									0	0	0
Changes in nuclear decommissioning trust liability									0	0	0
GenOn settlement, net of insurance proceeds									0
Net loss on deconsolidation of Agua Caliente and Ivanpah projects									0
Changes in other working capital									1,253	48	325
Cash provided/(used) by continuing operations									0	0	0
Cash provided by discontinued operations									0	0	0
Net Cash Provided by Operating Activities									0	0	0
Cash Flows from Investing Activities
Acquisition of businesses, net of cash acquired									0	0	0
Capital expenditures									0	0	0
Proceeds from renewable energy grants										0	0
Net proceeds from sale/(purchases) of emission allowances									0
Net proceeds from sale of emission allowances										0	0
Investments in nuclear decommissioning trust fund securities									0	0	0
Proceeds from sales of nuclear decommissioning trust fund securities									0	0	0
Proceeds from sale of assets, net of cash disposed and sale of discontinued operations, net of fees									0	0	0
Deconsolidation of Agua Caliente and Ivanpah projects									0
Changes in investments in unconsolidated affiliates									0	0	0
Net (contributions to)/distributions from discontinued operations									0	0	0
Other									0	0	0
Cash provided/(used) by continuing operations									0	0	0
Cash used by discontinued operations									0	0	0
Net Cash Used by Investing Activities									0	0	0
Cash Flows from Financing Activities
Payments (for)/from intercompany loans									0	0	0
Payments of dividends to preferred and common stockholders									0	0	0
Payment for preferred shares									0
Payments for preferred shares											0
Payments for debt extinguishment costs									0	0	0
Net distributions to noncontrolling interests from subsidiaries									0	0	0
Proceeds/(payments) from issuance of common stock									0	0	0
Proceeds from issuance of long-term debt									0	0	0
Payments of debt issuance costs									0	0	0
Payments for short and long-term debt									0	0	0
Receivable from affiliate										0
Receivable from affiliate									0
Other									0	0	0
Cash used by continuing operations									0	0	0
Cash provided/(used) by discontinued operations									0	0	0
Net Cash (Used)/Provided by Financing Activities									0	0	0
Effect of exchange rate changes on cash and cash equivalents									0	0	0
Change in Cash from discontinued operations									0	0	0
Net (Decrease)/Increase in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash									0	0	0
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period	0				0				0	0	0
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period				0				0	0	0	0
Guarantor Subsidiaries
Cash Flows from Operating Activities
Net (Loss)/Income									997	421	689
(Loss)/income from discontinued operations, net of income tax									62	91	86
Net Income/(Loss) from Continuing Operations									935	330	603
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Distributions and equity in earnings of unconsolidated affiliates									0	0	(5)
Depreciation, amortization and accretion									266	343	508
Provision for bad debts									79	56	42
Amortization of nuclear fuel									48	51	49
Amortization of financing costs and debt discount/premiums									0	0	0
Adjustment for debt extinguishment									0	0	0
Amortization of intangibles and out-of-market contracts									36	42	56
Amortization of unearned equity compensation									0	0	0
Net (gain)/loss on sale of assets and equity/cost method investments									(30)	2	70
Impairment losses									5	1,346	370
Changes in derivative instruments									25	(214)	28
Changes in deferred income taxes and liability for uncertain tax benefits									372	(300)	(1)
Changes in collateral deposits in support of risk management activities									(94)	(98)	384
Changes in nuclear decommissioning trust liability									60	11	41
GenOn settlement, net of insurance proceeds									0
Net loss on deconsolidation of Agua Caliente and Ivanpah projects									0
Changes in other working capital									311	82	(139)
Cash provided/(used) by continuing operations									2,013	1,651	2,006
Cash provided by discontinued operations									89	116	174
Net Cash Provided by Operating Activities									2,102	1,767	2,180
Cash Flows from Investing Activities
Acquisition of businesses, net of cash acquired									(40)	(14)	0
Capital expenditures									(192)	(180)	(172)
Proceeds from renewable energy grants										0	0
Net proceeds from sale/(purchases) of emission allowances									19
Net proceeds from sale of emission allowances										(66)	(1)
Investments in nuclear decommissioning trust fund securities									(572)		(551)
Proceeds from sales of nuclear decommissioning trust fund securities									513	501	510
Proceeds from sale of assets, net of cash disposed and sale of discontinued operations, net of fees									14	33	0
Deconsolidation of Agua Caliente and Ivanpah projects									0
Changes in investments in unconsolidated affiliates									0	0	0
Net (contributions to)/distributions from discontinued operations									0	0	0
Other									0	18	27
Cash provided/(used) by continuing operations									(258)	(88)	(187)
Cash used by discontinued operations									0	(13)	(9)
Net Cash Used by Investing Activities									(258)	(101)	(196)
Cash Flows from Financing Activities
Payments (for)/from intercompany loans									(1,701)	(1,525)	(1,856)
Payments of dividends to preferred and common stockholders									0	0	0
Payment for preferred shares									0
Payments for preferred shares											0
Payments for debt extinguishment costs									0	0	0
Net distributions to noncontrolling interests from subsidiaries									0	0	0
Proceeds/(payments) from issuance of common stock									0	0	0
Proceeds from issuance of long-term debt									0	0	0
Payments of debt issuance costs									0	0	0
Payments for short and long-term debt									0	0	(2)
Receivable from affiliate										0
Receivable from affiliate									0
Other									0	0	(3)
Cash used by continuing operations									(1,701)	(1,525)	(1,861)
Cash provided/(used) by discontinued operations									0	(109)	(163)
Net Cash (Used)/Provided by Financing Activities									(1,701)	(1,634)	(2,024)
Effect of exchange rate changes on cash and cash equivalents									0	0	0
Change in Cash from discontinued operations									89	(6)	2
Net (Decrease)/Increase in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash									54	38	(42)
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period	95				41				95	41	3
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period				41				3	41	3	45
Non-Guarantor Subsidiaries
Cash Flows from Operating Activities
Net (Loss)/Income									136	(543)	(534)
(Loss)/income from discontinued operations, net of income tax									75	(420)	0
Net Income/(Loss) from Continuing Operations									61	(123)	(534)
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Distributions and equity in earnings of unconsolidated affiliates									47	12	(14)
Depreciation, amortization and accretion									160	221	238
Provision for bad debts									6	0	3
Amortization of nuclear fuel									0	0	0
Amortization of financing costs and debt discount/premiums									6	13	13
Adjustment for debt extinguishment									0	0	4
Amortization of intangibles and out-of-market contracts									9	12	12
Amortization of unearned equity compensation									0	0	0
Net (gain)/loss on sale of assets and equity/cost method investments									(20)	(11)	0
Impairment losses									109	264	365
Changes in derivative instruments									15	50	21
Changes in deferred income taxes and liability for uncertain tax benefits									5	(9)	49
Changes in collateral deposits in support of risk management activities									(11)	18	12
Changes in nuclear decommissioning trust liability									0	0	0
GenOn settlement, net of insurance proceeds									0
Net loss on deconsolidation of Agua Caliente and Ivanpah projects									13
Changes in other working capital									(193)	(354)	(54)
Cash provided/(used) by continuing operations									207	93	115
Cash provided by discontinued operations									285	638	297
Net Cash Provided by Operating Activities									492	731	412
Cash Flows from Investing Activities
Acquisition of businesses, net of cash acquired									(203)	0	0
Capital expenditures									(151)	(43)	(326)
Proceeds from renewable energy grants										8	36
Net proceeds from sale/(purchases) of emission allowances									0
Net proceeds from sale of emission allowances										0	0
Investments in nuclear decommissioning trust fund securities									0	0	0
Proceeds from sales of nuclear decommissioning trust fund securities									0	0	0
Proceeds from sale of assets, net of cash disposed and sale of discontinued operations, net of fees									8	54	56
Deconsolidation of Agua Caliente and Ivanpah projects									(268)
Changes in investments in unconsolidated affiliates									(39)	(57)	(33)
Net (contributions to)/distributions from discontinued operations									(60)	0	0
Other									0	4	4
Cash provided/(used) by continuing operations									(713)	(34)	(263)
Cash used by discontinued operations									(725)	(966)	(379)
Net Cash Used by Investing Activities									(1,438)	(1,000)	(642)
Cash Flows from Financing Activities
Payments (for)/from intercompany loans									113	(39)	375
Payments of dividends to preferred and common stockholders									0	0	0
Payment for preferred shares									0
Payments for preferred shares											0
Payments for debt extinguishment costs									0	0	0
Net distributions to noncontrolling interests from subsidiaries									(16)	(30)	(27)
Proceeds/(payments) from issuance of common stock									0	0	0
Proceeds from issuance of long-term debt									163	94	271
Payments of debt issuance costs									0	(2)	0
Payments for short and long-term debt									(138)	(183)	(221)
Receivable from affiliate										0
Receivable from affiliate									0
Other									(4)	(8)	(4)
Cash used by continuing operations									118	(168)	394
Cash provided/(used) by discontinued operations									471	(60)	646
Net Cash (Used)/Provided by Financing Activities									589	(228)	1,040
Effect of exchange rate changes on cash and cash equivalents									1	(1)	1
Change in Cash from discontinued operations									31	(388)	564
Net (Decrease)/Increase in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash									(387)	(110)	247
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period	38				425				38	425	535
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period				425				535	425	535	288
NRG Energy, Inc. (Note Issuer)
Cash Flows from Operating Activities
Net (Loss)/Income									374	(2,169)	(718)
(Loss)/income from discontinued operations, net of income tax									(329)	(663)	(21)
Net Income/(Loss) from Continuing Operations									703	(1,506)	(697)
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:
Distributions and equity in earnings of unconsolidated affiliates									(1)	90	86
Depreciation, amortization and accretion									33	32	26
Provision for bad debts									0	12	0
Amortization of nuclear fuel									0	0	0
Amortization of financing costs and debt discount/premiums									23	16	20
Adjustment for debt extinguishment									44	49	138
Amortization of intangibles and out-of-market contracts									0	0	0
Amortization of unearned equity compensation									25	35	10
Net (gain)/loss on sale of assets and equity/cost method investments									1	0	69
Impairment losses									0	4	16
Changes in derivative instruments									11	(4)	(36)
Changes in deferred income taxes and liability for uncertain tax benefits									(372)	322	(60)
Changes in collateral deposits in support of risk management activities									0	0	0
Changes in nuclear decommissioning trust liability									0	0	0
GenOn settlement, net of insurance proceeds									(63)
Net loss on deconsolidation of Agua Caliente and Ivanpah projects									0
Changes in other working capital									(1,621)	62	(256)
Cash provided/(used) by continuing operations									(1,217)	(888)	(684)
Cash provided by discontinued operations									0	0	0
Net Cash Provided by Operating Activities									(1,217)	(888)	(684)
Cash Flows from Investing Activities
Acquisition of businesses, net of cash acquired									0	0	0
Capital expenditures									(45)	(31)	(46)
Proceeds from renewable energy grants										0	0
Net proceeds from sale/(purchases) of emission allowances									0
Net proceeds from sale of emission allowances										0	0
Investments in nuclear decommissioning trust fund securities									0	0	0
Proceeds from sales of nuclear decommissioning trust fund securities									0	0	0
Proceeds from sale of assets, net of cash disposed and sale of discontinued operations, net of fees									1,542	343	185
Deconsolidation of Agua Caliente and Ivanpah projects									0
Changes in investments in unconsolidated affiliates									0	0	0
Net (contributions to)/distributions from discontinued operations									0	150	(58)
Other									(6)	0	0
Cash provided/(used) by continuing operations									1,491	462	81
Cash used by discontinued operations									0	0	0
Net Cash Used by Investing Activities									1,491	462	81
Cash Flows from Financing Activities
Payments (for)/from intercompany loans									1,588	1,564	1,481
Payments of dividends to preferred and common stockholders									(37)	(38)	(76)
Payment for preferred shares									(1,250)
Payments for preferred shares											(226)
Payments for debt extinguishment costs									(32)	(42)	(121)
Net distributions to noncontrolling interests from subsidiaries									0	0	0
Proceeds/(payments) from issuance of common stock									21	(2)	1
Proceeds from issuance of long-term debt									937	1,084	4,141
Payments of debt issuance costs									(19)	(16)	(61)
Payments for short and long-term debt									(1,596)	(1,701)	(4,923)
Receivable from affiliate										(125)
Receivable from affiliate									(26)
Other									0	0	0
Cash used by continuing operations									(414)	724	216
Cash provided/(used) by discontinued operations									0	0	0
Net Cash (Used)/Provided by Financing Activities									(414)	724	216
Effect of exchange rate changes on cash and cash equivalents									0	0	0
Change in Cash from discontinued operations									0	0	0
Net (Decrease)/Increase in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash									(140)	298	(387)
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period	$ 480				$ 620				480	620	322
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period				$ 620				$ 322	$ 620	$ 322	$ 709

X

- Definition

The aggregate (income) expense recorded in earnings to allocate the cost of out-of-market contracts and intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash (income) expense, this element is added back to net income when calculating cash provided by (used in) operations using the indirect method.

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- Definition

Changes in cash collateral deposits for contracts supporting energy risk management activities.

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- Definition

The net change during the reporting period in the nuclear decommissioning trust liability, representing amounts collected, through rates or other authorized charges to electric utility customers, which are designated for funding the Company's portioning of the decommissioning of its nuclear facilities. Following the completion of the decommissioning, if surplus funds remain in the decommissioning trusts, any excess will be refunded to the respective rate payers.

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- Definition

Gains Losses on Extinguishment of Debt, Non-cash Portion

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Impairment Losses including other than temporary impairment losses

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- Definition

Income(Loss) from Equity Method Investment of Unconsolidated Affiliates

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(Investments in) Proceeds From Sales of Unconsolidated Affiliates

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Net (Contributions) To Distributions From Discontinued Operations

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- Definition

The cash inflow or outflow associated with intercompany loans for related parties.

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- Definition

The amount of cash received during the period for renewable energy grants related to capital projects.

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- Definition

Amount of amortization expense attributable to debt discount (premium) and debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
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The expense charged against earnings for the periodic recognition of capitalized costs related to purchasing power, fuel, or emission credits. These items may be purchased in one accounting period but are deducted from earnings over time through amortization.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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