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Condensed Consolidating Financial Information - CASH FLOWS (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Cash Flows from Operating Activities |  |
Net Income/(Loss) | $ 233 | $ (203)
(Loss)/income from discontinued operations | 0 | (34)
Net income | 233 | (169)
Adjustments to reconcile net income to net cash provided/(used) by operating activities: |  |
Distributions from unconsolidated affiliates | 10 | 13
Equity in losses of unconsolidated affiliates | 2 | (5)
Depreciation and amortization | 235 | 257
Provision for bad debts | 15 | 9
Amortization of nuclear fuel | 13 | 12
Amortization of financing costs and debt discount/premiums | 14 | 15
Adjustment for debt extinguishment | 2 | 0
Amortization of intangibles and out-of-market contracts | 22 | 30
Amortization of unearned equity compensation | 13 | 8
Changes in deferred income taxes and liability for uncertain tax benefits | (3) | 1
Changes in nuclear decommissioning trust liability | 34 | 36
Changes in derivative instruments | (247) | 38
Changes in collateral deposits in support of energy risk management activities | 163 | (127)
Gain on sale of emission allowances | (8) | 0
(Gain)/loss on sale of assets | (2) | (2)
Changes in other working capital | (139) | (198)
Cash provided/(used) by continuing operations | 357 | (82)
Cash used by discontinued operations | 0 | 15
Net Cash Provided/(Used) by Operating Activities | 357 | (67)
Cash Flows from Investing Activities |  |
Dividends from NRG Yield, Inc. | 0 | 0
Intercompany dividends |  | 0
Acquisition of Drop Down Assets, net of cash acquired | 0 | 0
Acquisitions of businesses, net of cash acquired | (62) | (3)
Capital expenditures | (358) | (236)
Decrease in notes receivable | 3 | 4
Purchases of emission allowances | (17) | (9)
Proceeds from sale of emission allowances | 23 | 11
Investments in nuclear decommissioning trust fund securities | (216) | (153)
Proceeds from the sale of nuclear decommissioning trust fund securities | 182 | 117
Proceeds from sale of assets, net of cash disposed of | 11 | 14
Change in investments in unconsolidated affiliates | 2 | (12)
Other | 0 | 18
Cash (used)/provided by continuing operations | (432) | (249)
Cash used by discontinued operations | 0 | (32)
Net Cash (Used)/Provided by Investing Activities | (432) | (281)
Cash Flows from Financing Activities |  |
Dividends from NRG Yield, Inc. | 0 | 0
Payment from/(for) intercompany loans | 0 | 0
Acquisition of Drop Down Assets, net of cash acquired | 0 | 0
Intercompany dividends |  | 0
Payment of dividends to common and preferred stockholders | (10) | (9)
Payment for treasury stock | (93) | 0
Net receipts from settlement of acquired derivatives that include financing elements | 0 | 1
Proceeds from issuance of long-term debt | 179 | 193
Payments for short and long-term debt | (228) | (177)
Distributions to, net of contributions from, noncontrolling interests in subsidiaries | 110 | (5)
Payment of debt issuance costs | (7) | (14)
Other - contingent consideration | 0 | (10)
Cash used by continuing operations | (49) | (21)
Cash used by discontinued operations | 0 | (132)
Net Cash Used by Financing Activities | (49) | (153)
Effect of exchange rate changes on cash and cash equivalents | 0 | (7)
Change in Cash from discontinued operations | 0 | (149)
Net Decrease in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash | (124) | (359)
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period | 1,536 | 1,386
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period | 1,412 | 1,027
Eliminations |  |
Cash Flows from Operating Activities |  |
Net Income/(Loss) | (556) | (26)
(Loss)/income from discontinued operations |  | 0
Net income |  | (26)
Adjustments to reconcile net income to net cash provided/(used) by operating activities: |  |
Distributions from unconsolidated affiliates | (3) | (5)
Equity in losses of unconsolidated affiliates | 0 | 0
Depreciation and amortization | 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
Changes in deferred income taxes and liability for uncertain tax benefits | 0 | 0
Changes in nuclear decommissioning trust liability | 0 | 0
Changes in derivative instruments | (18) | 0
Changes in collateral deposits in support of energy risk management activities | 0 | 0
Gain on sale of emission allowances | 0 |
(Gain)/loss on sale of assets | 0 | 0
Changes in other working capital | 577 | 63
Cash provided/(used) by continuing operations |  | 32
Cash used by discontinued operations |  | 0
Net Cash Provided/(Used) by Operating Activities | 0 | 32
Cash Flows from Investing Activities |  |
Dividends from NRG Yield, Inc. | (25) | (22)
Intercompany dividends |  | (129)
Acquisition of Drop Down Assets, net of cash acquired | 42 | 131
Acquisitions of businesses, net of cash acquired | 0 | 0
Capital expenditures | 0 | 0
Decrease in notes receivable | 0 | 0
Purchases of emission allowances | 0 | 0
Proceeds from sale of emission allowances | 0 | 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 of | 0 | 0
Change in investments in unconsolidated affiliates | 0 | 0
Other |  | 0
Cash (used)/provided by continuing operations |  | (20)
Cash used by discontinued operations |  | 0
Net Cash (Used)/Provided by Investing Activities | 17 | (20)
Cash Flows from Financing Activities |  |
Dividends from NRG Yield, Inc. | 25 | 22
Payment from/(for) intercompany loans | 0 | (32)
Acquisition of Drop Down Assets, net of cash acquired | (42) | (131)
Intercompany dividends |  | 129
Payment of dividends to common and preferred stockholders | 0 | 0
Payment for treasury stock | 0 |
Net receipts from settlement of acquired derivatives that include financing elements |  | 0
Proceeds from issuance of long-term debt | 0 | 0
Payments for short and long-term debt | 0 | 0
Distributions to, net of contributions from, noncontrolling interests in subsidiaries | 0 | 0
Payment of debt issuance costs | 0 | 0
Other - contingent consideration |  | 0
Cash used by continuing operations |  | (12)
Cash used by discontinued operations |  | 0
Net Cash Used by Financing Activities | (17) | (12)
Effect of exchange rate changes on cash and cash equivalents |  | 0
Change in Cash from discontinued operations |  | 0
Net 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/(Loss) | 346 | 78
(Loss)/income from discontinued operations |  | 0
Net income |  | 78
Adjustments to reconcile net income to net cash provided/(used) by operating activities: |  |
Distributions from unconsolidated affiliates | 0 | 0
Equity in losses of unconsolidated affiliates | 0 | 1
Depreciation and amortization | 73 | 99
Provision for bad debts | 17 | 8
Amortization of nuclear fuel | 13 | 12
Amortization of financing costs and debt discount/premiums | 0 | 0
Adjustment for debt extinguishment | 0 |
Amortization of intangibles and out-of-market contracts | 3 | 6
Amortization of unearned equity compensation | 0 | 0
Changes in deferred income taxes and liability for uncertain tax benefits | 114 | 19
Changes in nuclear decommissioning trust liability | 34 | 36
Changes in derivative instruments | 5 | (4)
Changes in collateral deposits in support of energy risk management activities | 162 | (136)
Gain on sale of emission allowances | (8) |
(Gain)/loss on sale of assets | (3) | (2)
Changes in other working capital | (442) | (118)
Cash provided/(used) by continuing operations |  | (1)
Cash used by discontinued operations |  | 0
Net Cash Provided/(Used) by Operating Activities | 314 | (1)
Cash Flows from Investing Activities |  |
Dividends from NRG Yield, Inc. | 0 | 0
Intercompany dividends |  | 0
Acquisition of Drop Down Assets, net of cash acquired | 0 | 0
Acquisitions of businesses, net of cash acquired | (2) | 0
Capital expenditures | (61) | (64)
Decrease in notes receivable | 0 | 0
Purchases of emission allowances | (17) | (9)
Proceeds from sale of emission allowances | 23 | 11
Investments in nuclear decommissioning trust fund securities | (216) | (153)
Proceeds from the sale of nuclear decommissioning trust fund securities | 182 | 117
Proceeds from sale of assets, net of cash disposed of | 10 | 11
Change in investments in unconsolidated affiliates | 0 | 0
Other |  | 18
Cash (used)/provided by continuing operations |  | (69)
Cash used by discontinued operations |  | 0
Net Cash (Used)/Provided by Investing Activities | (81) | (69)
Cash Flows from Financing Activities |  |
Dividends from NRG Yield, Inc. | 0 | 0
Payment from/(for) intercompany loans | 18 | 65
Acquisition of Drop Down Assets, net of cash acquired | 0 | 0
Intercompany dividends |  | 0
Payment of dividends to common and preferred stockholders | 0 | 0
Payment for treasury stock | 0 |
Net receipts from settlement of acquired derivatives that include financing elements |  | 0
Proceeds from issuance of long-term debt | 0 | 0
Payments for short and long-term debt | 0 | 0
Distributions to, net of contributions from, noncontrolling interests in subsidiaries | 0 | 0
Payment of debt issuance costs | 0 | 0
Other - contingent consideration |  | 0
Cash used by continuing operations |  | 65
Cash used by discontinued operations |  | 0
Net Cash Used by Financing Activities | 18 | 65
Effect of exchange rate changes on cash and cash equivalents |  | 0
Change in Cash from discontinued operations |  | 0
Net Decrease in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash | 251 | (5)
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period | 41 | 13
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period | 292 | 8
Non-Guarantor Subsidiaries |  |
Cash Flows from Operating Activities |  |
Net Income/(Loss) | 148 | (89)
(Loss)/income from discontinued operations |  | (37)
Net income |  | (52)
Adjustments to reconcile net income to net cash provided/(used) by operating activities: |  |
Distributions from unconsolidated affiliates | 13 | 18
Equity in losses of unconsolidated affiliates | 1 | (7)
Depreciation and amortization | 154 | 150
Provision for bad debts | (2) | 1
Amortization of nuclear fuel | 0 | 0
Amortization of financing costs and debt discount/premiums | 10 | 11
Adjustment for debt extinguishment | 0 |
Amortization of intangibles and out-of-market contracts | 19 | 24
Amortization of unearned equity compensation | 0 | 0
Changes in deferred income taxes and liability for uncertain tax benefits | 27 | (46)
Changes in nuclear decommissioning trust liability | 0 | 0
Changes in derivative instruments | (220) | 43
Changes in collateral deposits in support of energy risk management activities | 1 | 9
Gain on sale of emission allowances | 0 |
(Gain)/loss on sale of assets | 1 | 0
Changes in other working capital | 22 | 458
Cash provided/(used) by continuing operations |  | 609
Cash used by discontinued operations |  | 15
Net Cash Provided/(Used) by Operating Activities | 174 | 624
Cash Flows from Investing Activities |  |
Dividends from NRG Yield, Inc. | 0 | 0
Intercompany dividends |  | 0
Acquisition of Drop Down Assets, net of cash acquired | (42) | (131)
Acquisitions of businesses, net of cash acquired | (60) | (3)
Capital expenditures | (276) | (168)
Decrease in notes receivable | 3 | 4
Purchases of emission allowances | 0 | 0
Proceeds from sale of emission allowances | 0 | 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 of | 1 | 3
Change in investments in unconsolidated affiliates | 2 | (12)
Other |  | 0
Cash (used)/provided by continuing operations |  | (307)
Cash used by discontinued operations |  | (32)
Net Cash (Used)/Provided by Investing Activities | (372) | (339)
Cash Flows from Financing Activities |  |
Dividends from NRG Yield, Inc. | (25) | (22)
Payment from/(for) intercompany loans | 80 | (428)
Acquisition of Drop Down Assets, net of cash acquired | 0 | 0
Intercompany dividends |  | (129)
Payment of dividends to common and preferred stockholders | 0 | 0
Payment for treasury stock | 0 |
Net receipts from settlement of acquired derivatives that include financing elements |  | 1
Proceeds from issuance of long-term debt | 179 | 167
Payments for short and long-term debt | (222) | (146)
Distributions to, net of contributions from, noncontrolling interests in subsidiaries | 110 | (5)
Payment of debt issuance costs | (6) | (10)
Other - contingent consideration |  | (10)
Cash used by continuing operations |  | (582)
Cash used by discontinued operations |  | (132)
Net Cash Used by Financing Activities | 116 | (714)
Effect of exchange rate changes on cash and cash equivalents |  | (7)
Change in Cash from discontinued operations |  | (149)
Net Decrease in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash | (82) | (287)
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period | 852 | 1,050
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period | 770 | 763
NRG Energy, Inc. (Note Issuer) |  |
Cash Flows from Operating Activities |  |
Net Income/(Loss) | 295 | (166)
(Loss)/income from discontinued operations |  | 3
Net income |  | (169)
Adjustments to reconcile net income to net cash provided/(used) by operating activities: |  |
Distributions from unconsolidated affiliates | 0 | 0
Equity in losses of unconsolidated affiliates | 1 | 1
Depreciation and amortization | 8 | 8
Provision for bad debts | 0 | 0
Amortization of nuclear fuel | 0 | 0
Amortization of financing costs and debt discount/premiums | 4 | 4
Adjustment for debt extinguishment | 2 |
Amortization of intangibles and out-of-market contracts | 0 | 0
Amortization of unearned equity compensation | 13 | 8
Changes in deferred income taxes and liability for uncertain tax benefits | (144) | 28
Changes in nuclear decommissioning trust liability | 0 | 0
Changes in derivative instruments | (14) | (1)
Changes in collateral deposits in support of energy risk management activities | 0 | 0
Gain on sale of emission allowances | 0 |
(Gain)/loss on sale of assets | 0 | 0
Changes in other working capital | (296) | (601)
Cash provided/(used) by continuing operations |  | (722)
Cash used by discontinued operations |  | 0
Net Cash Provided/(Used) by Operating Activities | (131) | (722)
Cash Flows from Investing Activities |  |
Dividends from NRG Yield, Inc. | 25 | 22
Intercompany dividends |  | 129
Acquisition of Drop Down Assets, net of cash acquired | 0 | 0
Acquisitions of businesses, net of cash acquired | 0 | 0
Capital expenditures | (21) | (4)
Decrease in notes receivable | 0 | 0
Purchases of emission allowances | 0 | 0
Proceeds from sale of emission allowances | 0 | 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 of | 0 | 0
Change in investments in unconsolidated affiliates | 0 | 0
Other |  | 0
Cash (used)/provided by continuing operations |  | 147
Cash used by discontinued operations |  | 0
Net Cash (Used)/Provided by Investing Activities | 4 | 147
Cash Flows from Financing Activities |  |
Dividends from NRG Yield, Inc. | 0 | 0
Payment from/(for) intercompany loans | (98) | 395
Acquisition of Drop Down Assets, net of cash acquired | 42 | 131
Intercompany dividends |  | 0
Payment of dividends to common and preferred stockholders | (10) | (9)
Payment for treasury stock | (93) |
Net receipts from settlement of acquired derivatives that include financing elements |  | 0
Proceeds from issuance of long-term debt | 0 | 26
Payments for short and long-term debt | (6) | (31)
Distributions to, net of contributions from, noncontrolling interests in subsidiaries | 0 | 0
Payment of debt issuance costs | (1) | (4)
Other - contingent consideration |  | 0
Cash used by continuing operations |  | 508
Cash used by discontinued operations |  | 0
Net Cash Used by Financing Activities | (166) | 508
Effect of exchange rate changes on cash and cash equivalents |  | 0
Change in Cash from discontinued operations |  | 0
Net Decrease in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash | (293) | (67)
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period | 643 | 323
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period | $ 350 | $ 256

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. + References No definition available. + Details
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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. + References No definition available. + Details
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- Definition Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 + Details
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- Definition Amount of cash inflow (outflow) from (to) a noncontrolling interest. Excludes dividends paid to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3291-108585 + Details
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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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