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Condensed Consolidating Financial Information - CASH FLOWS (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash Flows from Operating Activities
Net Income	$ 482	$ 233
Income/(loss) from discontinued operations	388	(5)
Net income	94	238
Adjustments to reconcile net income to net cash provided/(used) by operating activities:
Equity in losses of unconsolidated affiliates	21	(1)
Depreciation, amortization and accretion	92	131
Provision for bad debts	26	15
Amortization of nuclear fuel	13	13
Amortization of financing costs and debt discount/premiums	7	6
Adjustment for debt extinguishment	0	2
Amortization of intangibles and out-of-market contracts	6	9
Amortization of unearned equity compensation	4	6
Loss (gain) on sale of assets	3	(10)
Changes in derivative instruments	(15)	(203)
Changes in deferred income taxes and liability for uncertain tax benefits	(2)	(1)
Changes in collateral deposits in support of energy risk management activities	(123)	163
Changes in nuclear decommissioning trust liability	9	34
Changes in other working capital	(270)	(156)
Cash used by continuing operations	(135)	246
Cash provided/(used) by discontinued operations	8	104
Net Cash Provided/(Used) by Operating Activities	(127)	350
Cash Flows from Investing Activities
Payments for acquisitions of businesses	(16)	(2)
Capital expenditures	(49)	(155)
Proceeds from sale of emission allowances	0	6
Investments in nuclear decommissioning trust fund securities	(122)	(216)
Proceeds from the sale of nuclear decommissioning trust fund securities	113	182
Proceeds from sale of assets, net of cash disposed and sale of discontinued operations, net of fees	1,313	53
Changes in investments in unconsolidated affiliates	4	(8)
Contributions to discontinued operations	(44)	(29)
Other	(1)	0
Cash (used)/provided by continuing operations	1,198	(169)
Cash used by discontinued operations	(2)	(291)
Net Cash (Used)/Provided by Investing Activities	1,196	(460)
Cash Flows from Financing Activities
Payments (for)/from intercompany loans	0	0
Payments of dividends to common stockholders	(8)	(10)
Payments for treasury stock	(747)	(93)
Distributions to noncontrolling interests from subsidiaries	(1)	(10)
Proceeds from issuance of common stock	2	7
Payment of debt issuance costs	0	(2)
Payments for long-term debt	(37)	(39)
Cash used by continuing operations	(791)	(147)
Cash provided by discontinued operations	43	133
Net Cash Used by Financing Activities	(748)	(14)
Change in Cash from discontinued operations	49	(54)
Net Increase/(Decrease) in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash	272	(70)
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period	613	1,086
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period	885	1,016
Eliminations
Cash Flows from Operating Activities
Net Income	(309)	(333)
Income/(loss) from discontinued operations	0	0
Net income	(309)	(333)
Adjustments to reconcile net income to net cash provided/(used) by operating activities:
Equity in losses of unconsolidated affiliates	0	0
Depreciation, amortization and accretion	0	0
Provision for bad debts	0	0
Amortization of nuclear fuel	0	0
Amortization of financing costs and debt discount/premiums	0	0
Adjustment for debt extinguishment		0
Amortization of intangibles and out-of-market contracts	0	0
Amortization of unearned equity compensation	0	0
Loss (gain) on sale of assets	0	0
Changes in derivative instruments	0	(17)
Changes in deferred income taxes and liability for uncertain tax benefits	0	0
Changes in collateral deposits in support of energy risk management activities	0	0
Changes in nuclear decommissioning trust liability	0	0
Changes in other working capital	309	350
Cash used by continuing operations	0	0
Cash provided/(used) by discontinued operations	0	0
Net Cash Provided/(Used) by Operating Activities	0	0
Cash Flows from Investing Activities
Payments for acquisitions of businesses	0	0
Capital expenditures	0	0
Proceeds from sale of emission allowances		0
Investments in nuclear decommissioning trust fund securities	0	0
Proceeds from the sale of nuclear decommissioning trust fund securities	0	0
Proceeds from sale of assets, net of cash disposed and sale of discontinued operations, net of fees	0	0
Changes in investments in unconsolidated affiliates	0	0
Contributions to discontinued operations	0	0
Other	0
Cash (used)/provided by continuing operations	0	0
Cash used by discontinued operations	0	0
Net Cash (Used)/Provided by Investing Activities	0	0
Cash Flows from Financing Activities
Payments (for)/from intercompany loans	0	0
Payments of dividends to common stockholders	0	0
Payments for treasury stock	0	0
Distributions to noncontrolling interests from subsidiaries	0	0
Proceeds from issuance of common stock	0	0
Payment of debt issuance costs		0
Payments for long-term debt	0	0
Cash used by continuing operations	0	0
Cash provided by discontinued operations	0	0
Net Cash Used by Financing Activities	0	0
Change in Cash from discontinued operations	0	0
Net Increase/(Decrease) in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash	0	0
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period	0	0
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period	0	0
Guarantor Subsidiaries
Cash Flows from Operating Activities
Net Income	255	331
Income/(loss) from discontinued operations	9	15
Net income	246	316
Adjustments to reconcile net income to net cash provided/(used) by operating activities:
Equity in losses of unconsolidated affiliates	0	0
Depreciation, amortization and accretion	59	67
Provision for bad debts	23	15
Amortization of nuclear fuel	13	13
Amortization of financing costs and debt discount/premiums	0	0
Adjustment for debt extinguishment		0
Amortization of intangibles and out-of-market contracts	6	7
Amortization of unearned equity compensation	0	0
Loss (gain) on sale of assets	0	(11)
Changes in derivative instruments	(29)	(203)
Changes in deferred income taxes and liability for uncertain tax benefits	0	113
Changes in collateral deposits in support of energy risk management activities	(114)	162
Changes in nuclear decommissioning trust liability	9	34
Changes in other working capital	(221)	277
Cash used by continuing operations	(8)	790
Cash provided/(used) by discontinued operations	17	32
Net Cash Provided/(Used) by Operating Activities	9	822
Cash Flows from Investing Activities
Payments for acquisitions of businesses	(16)	(2)
Capital expenditures	(36)	(60)
Proceeds from sale of emission allowances		6
Investments in nuclear decommissioning trust fund securities	(122)	(216)
Proceeds from the sale of nuclear decommissioning trust fund securities	113	182
Proceeds from sale of assets, net of cash disposed and sale of discontinued operations, net of fees	1	11
Changes in investments in unconsolidated affiliates	0	0
Contributions to discontinued operations	0	0
Other	0
Cash (used)/provided by continuing operations	(60)	(79)
Cash used by discontinued operations	0	(1)
Net Cash (Used)/Provided by Investing Activities	(60)	(80)
Cash Flows from Financing Activities
Payments (for)/from intercompany loans	(4)	(481)
Payments of dividends to common stockholders	0	0
Payments for treasury stock	0	0
Distributions to noncontrolling interests from subsidiaries	0	0
Proceeds from issuance of common stock	0	0
Payment of debt issuance costs		0
Payments for long-term debt	0	0
Cash used by continuing operations	(4)	(481)
Cash provided by discontinued operations	0	0
Net Cash Used by Financing Activities	(4)	(481)
Change in Cash from discontinued operations	17	31
Net Increase/(Decrease) in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash	(72)	230
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period	95	41
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period	23	271
Non-Guarantor Subsidiaries
Cash Flows from Operating Activities
Net Income	54	(61)
Income/(loss) from discontinued operations	5	(20)
Net income	49	(41)
Adjustments to reconcile net income to net cash provided/(used) by operating activities:
Equity in losses of unconsolidated affiliates	21	(2)
Depreciation, amortization and accretion	25	56
Provision for bad debts	3	0
Amortization of nuclear fuel	0	0
Amortization of financing costs and debt discount/premiums	0	0
Adjustment for debt extinguishment		0
Amortization of intangibles and out-of-market contracts	0	2
Amortization of unearned equity compensation	0	0
Loss (gain) on sale of assets	0	1
Changes in derivative instruments	5	2
Changes in deferred income taxes and liability for uncertain tax benefits	1	29
Changes in collateral deposits in support of energy risk management activities	(9)	1
Changes in nuclear decommissioning trust liability	0	0
Changes in other working capital	(137)	(339)
Cash used by continuing operations	(42)	(291)
Cash provided/(used) by discontinued operations	(9)	72
Net Cash Provided/(Used) by Operating Activities	(51)	(219)
Cash Flows from Investing Activities
Payments for acquisitions of businesses	0	0
Capital expenditures	(6)	(74)
Proceeds from sale of emission allowances		0
Investments in nuclear decommissioning trust fund securities	0	0
Proceeds from the sale of nuclear decommissioning trust fund securities	0	0
Proceeds from sale of assets, net of cash disposed and sale of discontinued operations, net of fees	404	0
Changes in investments in unconsolidated affiliates	4	(8)
Contributions to discontinued operations	(44)	(29)
Other	0
Cash (used)/provided by continuing operations	358	(111)
Cash used by discontinued operations	(2)	(290)
Net Cash (Used)/Provided by Investing Activities	356	(401)
Cash Flows from Financing Activities
Payments (for)/from intercompany loans	(290)	417
Payments of dividends to common stockholders	0	0
Payments for treasury stock	0	0
Distributions to noncontrolling interests from subsidiaries	(1)	(10)
Proceeds from issuance of common stock	0	0
Payment of debt issuance costs		0
Payments for long-term debt	(33)	(34)
Cash used by continuing operations	(324)	373
Cash provided by discontinued operations	43	133
Net Cash Used by Financing Activities	(281)	506
Change in Cash from discontinued operations	32	(85)
Net Increase/(Decrease) in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash	(8)	(29)
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period	38	425
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period	30	396
NRG Energy, Inc. (Note Issuer)
Cash Flows from Operating Activities
Net Income	482	296
Income/(loss) from discontinued operations	374	0
Net income	108	296
Adjustments to reconcile net income to net cash provided/(used) by operating activities:
Equity in losses of unconsolidated affiliates	0	1
Depreciation, amortization and accretion	8	8
Provision for bad debts	0	0
Amortization of nuclear fuel	0	0
Amortization of financing costs and debt discount/premiums	7	6
Adjustment for debt extinguishment		2
Amortization of intangibles and out-of-market contracts	0	0
Amortization of unearned equity compensation	4	6
Loss (gain) on sale of assets	3	0
Changes in derivative instruments	9	15
Changes in deferred income taxes and liability for uncertain tax benefits	(3)	(143)
Changes in collateral deposits in support of energy risk management activities	0	0
Changes in nuclear decommissioning trust liability	0	0
Changes in other working capital	(221)	(444)
Cash used by continuing operations	(85)	(253)
Cash provided/(used) by discontinued operations	0	0
Net Cash Provided/(Used) by Operating Activities	(85)	(253)
Cash Flows from Investing Activities
Payments for acquisitions of businesses	0	0
Capital expenditures	(7)	(21)
Proceeds from sale of emission allowances		0
Investments in nuclear decommissioning trust fund securities	0	0
Proceeds from the sale of nuclear decommissioning trust fund securities	0	0
Proceeds from sale of assets, net of cash disposed and sale of discontinued operations, net of fees	908	42
Changes in investments in unconsolidated affiliates	0	0
Contributions to discontinued operations	0	0
Other	(1)
Cash (used)/provided by continuing operations	900	21
Cash used by discontinued operations	0	0
Net Cash (Used)/Provided by Investing Activities	900	21
Cash Flows from Financing Activities
Payments (for)/from intercompany loans	294	64
Payments of dividends to common stockholders	(8)	(10)
Payments for treasury stock	(747)	(93)
Distributions to noncontrolling interests from subsidiaries	0	0
Proceeds from issuance of common stock	2	7
Payment of debt issuance costs		(2)
Payments for long-term debt	(4)	(5)
Cash used by continuing operations	(463)	(39)
Cash provided by discontinued operations	0	0
Net Cash Used by Financing Activities	(463)	(39)
Change in Cash from discontinued operations	0	0
Net Increase/(Decrease) in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash	352	(271)
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period	480	620
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period	$ 832	$ 349

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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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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