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Condensed Consolidating Financial Information - Statements of Cash Flows (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash Flows from Operating Activities                      
Net Income/(Loss) $ 3,385 $ 372 $ 202 $ 482 $ (13) $ (49) $ 96 $ 233 $ 4,441 $ 268 $ (2,337)
Income/(loss) from discontinued operations, net of income tax (78) (2) 13 388 80 (336) 69 (5) 321 (192) (992)
Income/(loss) from continuing operations 3,463 $ 374 $ 189 94 (93) $ 287 $ 27 238 4,120 460 (1,345)
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:                      
Distributions and equity in earnings of unconsolidated affiliates and consolidated subsidiaries                 14 46 102
Depreciation and amortization                 373 421 596
Accretion of asset retirement obligations                 51 38 44
Provision for bad debts                 95 85 68
Amortization of nuclear fuel                 52 48 51
Amortization of financing costs and debt discount/premiums                 26 29 29
Adjustment for debt extinguishment                 51 44 49
Amortization of emission allowances                 38 45 54
Amortization of unearned equity compensation                 20 25 35
Net gain on sale of assets and disposal of assets                 (23) (49) (9)
Impairment losses                 113 114 1,614
Changes in derivative instruments                 34 37 (170)
Changes in deferred income taxes and liability for uncertain tax benefits                 (3,353) 5 13
Changes in collateral deposits in support of risk management activities                 105 (105) (80)
Changes in nuclear decommissioning trust liability                 37 60 11
GenOn settlement, net of insurance proceeds                 0 (63) 0
Net loss on deconsolidation of Agua Caliente and Ivanpah projects                 0 13 0
Changes in other working capital                 (348) (250) (206)
Cash provided by continuing operations                 1,405 1,003 856
Cash provided/(used) by discontinued operations                 8 374 754
Net Cash Provided by Operating Activities                 1,413 1,377 1,610
Cash Flows from Investing Activities                      
Intercompany dividends                 0 0 0
Payments for acquisitions of businesses                 (355) (243) (14)
Capital expenditures                 (228) (388) (254)
Net proceeds from sale of emission allowances                 11 19 66
Investments in nuclear decommissioning trust fund securities                 (416) (572) (512)
Proceeds from sales of nuclear decommissioning trust fund securities                 381 513 501
Proceeds from sale of assets, net of cash disposed and sale of discontinued operations, net of fees                 1,294 1,564 430
Deconsolidation of Agua Caliente and Ivanpah projects                 0 (268) 0
Changes in investments in unconsolidated affiliates                 (91) (39) (57)
Net contributions to discontinued operations                 (44) (60) 150
Other                 6 (6) 30
Cash provided by continuing operations                 558 520 340
Cash used by discontinued operations                 (2) (725) (979)
Net Cash Provided/(Used) by Investing Activities                 556 (205) (639)
Cash Flows from Financing Activities                      
Intercompany dividends and transfers                 0 0 0
Payments of dividends to common stockholders                 (32) (37) (38)
Payment for preferred shares                 (1,440) (1,250)  
Payments for debt extinguishment costs                 (26) (32) (42)
Net distributions to redeemable noncontrolling interests from subsidiaries                 (2) (16) (30)
Proceeds/(payments) from issuance of common stock                 3 21 (2)
Proceeds from issuance of long-term debt                 1,916 1,100 1,178
Payments of debt issuance costs                 (35) (19) (18)
Payments for short and long-term debt                 (2,571) (1,734) (1,884)
Receivable from affiliate                 0 (26) (125)
Other                 (4) (4) (8)
Cash used by continuing operations                 (2,191) (1,997) (969)
Cash provided/(used) by discontinued operations                 43 471 (169)
Net Cash (Used)/Provided by Financing Activities                 (2,148) (1,526) (1,138)
Effect of exchange rate changes on cash and cash equivalents                 0 1 (1)
Change in Cash from discontinued operations                 49 120 (394)
Net (Decrease)/Increase in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash                 (228) (473) 226
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period 385       613       385 613 1,086
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period       613       1,086 613 1,086 860
Eliminations                      
Cash Flows from Operating Activities                      
Net Income/(Loss)                 (1,610) (1,239) (46)
Income/(loss) from discontinued operations, net of income tax                 0 0 0
Income/(loss) from continuing operations                 (1,610) (1,239) (46)
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:                      
Distributions and equity in earnings of unconsolidated affiliates and consolidated subsidiaries                 1,610 1,253 48
Depreciation and amortization                 0 0 0
Accretion of asset retirement obligations                 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 emission allowances                 0 0 0
Amortization of unearned equity compensation                 0 0 0
Net gain on sale of assets and disposal of assets                 0 0 0
Impairment losses                 0 0 0
Changes in derivative instruments                 0 (14) (2)
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                 0 0 0
Cash provided by continuing operations                 0 0 0
Cash provided/(used) by discontinued operations                 0 0 0
Net Cash Provided by Operating Activities                 0 0 0
Cash Flows from Investing Activities                      
Intercompany dividends                 (2,513) (2,006) (1,665)
Payments for acquisitions of businesses                 0 0 0
Capital expenditures                 0 0 0
Net proceeds from sale of emission allowances                 0 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 discontinued operations                 0 0 0
Other                 0 0 0
Cash provided by continuing operations                 (2,513) (2,006) (1,665)
Cash used by discontinued operations                 0 0 0
Net Cash Provided/(Used) by Investing Activities                 (2,513) (2,006) (1,665)
Cash Flows from Financing Activities                      
Intercompany dividends and transfers                 2,513 2,006 1,665
Payments of dividends to common stockholders                 0 0 0
Payment for preferred shares                 0 0  
Payments for debt extinguishment costs                 0 0 0
Net distributions to redeemable 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 0
Other                 0 0 0
Cash used by continuing operations                 2,513 2,006 1,665
Cash provided/(used) by discontinued operations                 0 0 0
Net Cash (Used)/Provided by Financing Activities                 2,513 2,006 1,665
Effect of exchange rate changes on cash and cash equivalents                   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 Income/(Loss)                 1,493 997 421
Income/(loss) from discontinued operations, net of income tax                 9 62 91
Income/(loss) from continuing operations                 1,484 935 330
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:                      
Distributions and equity in earnings of unconsolidated affiliates and consolidated subsidiaries                 (48) (23) (18)
Depreciation and amortization                 212 238 343
Accretion of asset retirement obligations                 43 28 37
Provision for bad debts                 78 79 56
Amortization of nuclear fuel                 52 48 51
Amortization of financing costs and debt discount/premiums                 0 0 0
Adjustment for debt extinguishment                 0 0 0
Amortization of emission allowances                 24 36 42
Amortization of unearned equity compensation                 0 0 0
Net gain on sale of assets and disposal of assets                 (20) (30) 2
Impairment losses                 1 5 1,346
Changes in derivative instruments                 20 25 (214)
Changes in deferred income taxes and liability for uncertain tax benefits                 (525) 372 (300)
Changes in collateral deposits in support of risk management activities                 101 (94) (98)
Changes in nuclear decommissioning trust liability                 37 60 11
GenOn settlement, net of insurance proceeds                   0  
Net loss on deconsolidation of Agua Caliente and Ivanpah projects                   0  
Changes in other working capital                 (220) (100) (15)
Cash provided by continuing operations                 1,239 1,579 1,573
Cash provided/(used) by discontinued operations                 17 89 116
Net Cash Provided by Operating Activities                 1,256 1,668 1,689
Cash Flows from Investing Activities                      
Intercompany dividends                 0 0 0
Payments for acquisitions of businesses                 (355) (40) (14)
Capital expenditures                 (164) (192) (180)
Net proceeds from sale of emission allowances                 11 19 66
Investments in nuclear decommissioning trust fund securities                 (416) (572)  
Proceeds from sales of nuclear decommissioning trust fund securities                 381 513 501
Proceeds from sale of assets, net of cash disposed and sale of discontinued operations, net of fees                 1 14 33
Deconsolidation of Agua Caliente and Ivanpah projects                   0  
Changes in investments in unconsolidated affiliates                 0 0 0
Net contributions to discontinued operations                 0 0 0
Other                 0 0 18
Cash provided by continuing operations                 (542) (258) (88)
Cash used by discontinued operations                 0 0 (13)
Net Cash Provided/(Used) by Investing Activities                 (542) (258) (101)
Cash Flows from Financing Activities                      
Intercompany dividends and transfers                 (751) (1,267) (1,447)
Payments of dividends to common stockholders                 0 0 0
Payment for preferred shares                 0 0  
Payments for debt extinguishment costs                 0 0 0
Net distributions to redeemable 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 0
Other                 (4) 0 0
Cash used by continuing operations                 (755) (1,267) (1,447)
Cash provided/(used) by discontinued operations                 0 0 (109)
Net Cash (Used)/Provided by Financing Activities                 (755) (1,267) (1,556)
Effect of exchange rate changes on cash and cash equivalents                   0 0
Change in Cash from discontinued operations                 17 89 (6)
Net (Decrease)/Increase in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash                 (58) 54 38
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period 37       95       37 95 41
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period       95       41 95 41 3
Non-Guarantor Subsidiaries                      
Cash Flows from Operating Activities                      
Net Income/(Loss)                 120 136 (543)
Income/(loss) from discontinued operations, net of income tax                 5 75 (420)
Income/(loss) from continuing operations                 115 61 (123)
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:                      
Distributions and equity in earnings of unconsolidated affiliates and consolidated subsidiaries                 14 47 12
Depreciation and amortization                 130 150 221
Accretion of asset retirement obligations                 8 10 7
Provision for bad debts                 17 6 0
Amortization of nuclear fuel                 0 0 0
Amortization of financing costs and debt discount/premiums                 0 6 13
Adjustment for debt extinguishment                 3 0 0
Amortization of emission allowances                 14 9 12
Amortization of unearned equity compensation                 0 0 0
Net gain on sale of assets and disposal of assets                 0 (20) (11)
Impairment losses                 105 109 264
Changes in derivative instruments                 (24) 15 50
Changes in deferred income taxes and liability for uncertain tax benefits                 (168) 5 (9)
Changes in collateral deposits in support of risk management activities                 4 (11) 18
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                 (118) (166) (396)
Cash provided by continuing operations                 100 234 58
Cash provided/(used) by discontinued operations                 (9) 285 638
Net Cash Provided by Operating Activities                 91 519 696
Cash Flows from Investing Activities                      
Intercompany dividends                 0 0 0
Payments for acquisitions of businesses                 0 (203) 0
Capital expenditures                 (27) (151) (43)
Net proceeds from sale of emission allowances                 0 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                 400 8 54
Deconsolidation of Agua Caliente and Ivanpah projects                   (268)  
Changes in investments in unconsolidated affiliates                 (91) (39) (57)
Net contributions to discontinued operations                 (44) (60) 0
Other                 0 0 12
Cash provided by continuing operations                 238 (713) (34)
Cash used by discontinued operations                 (2) (725) (966)
Net Cash Provided/(Used) by Investing Activities                 236 (1,438) (1,000)
Cash Flows from Financing Activities                      
Intercompany dividends and transfers                 (214) 86 (4)
Payments of dividends to common stockholders                 0 0 0
Payment for preferred shares                 0 0  
Payments for debt extinguishment costs                 0 0 0
Net distributions to redeemable noncontrolling interests from subsidiaries                 (2) (16) (30)
Proceeds/(payments) from issuance of common stock                 0 0 0
Proceeds from issuance of long-term debt                 0 163 94
Payments of debt issuance costs                 0 0 (2)
Payments for short and long-term debt                 (139) (138) (183)
Receivable from affiliate                   0 0
Other                 0 (4) (8)
Cash used by continuing operations                 (355) 91 (133)
Cash provided/(used) by discontinued operations                 43 471 (60)
Net Cash (Used)/Provided by Financing Activities                 (312) 562 (193)
Effect of exchange rate changes on cash and cash equivalents                   1 (1)
Change in Cash from discontinued operations                 32 31 (388)
Net (Decrease)/Increase in Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash                 (17) (387) (110)
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period 21       38       21 38 425
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period       38       425 38 425 535
NRG Energy, Inc. (Note Issuer)                      
Cash Flows from Operating Activities                      
Net Income/(Loss)                 4,438 374 (2,169)
Income/(loss) from discontinued operations, net of income tax                 307 (329) (663)
Income/(loss) from continuing operations                 4,131 703 (1,506)
Adjustments to reconcile net income/(loss) to net cash provided by operating activities:                      
Distributions and equity in earnings of unconsolidated affiliates and consolidated subsidiaries                 (1,562) (1,231) 60
Depreciation and amortization                 31 33 32
Accretion of asset retirement obligations                 0 0 0
Provision for bad debts                 0 0 12
Amortization of nuclear fuel                 0 0 0
Amortization of financing costs and debt discount/premiums                 26 23 16
Adjustment for debt extinguishment                 48 44 49
Amortization of emission allowances                 0 0 0
Amortization of unearned equity compensation                 20 25 35
Net gain on sale of assets and disposal of assets                 (3) 1 0
Impairment losses                 7 0 4
Changes in derivative instruments                 38 11 (4)
Changes in deferred income taxes and liability for uncertain tax benefits                 (2,660) (372) 322
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                 (10) 16 205
Cash provided by continuing operations                 66 (810) (775)
Cash provided/(used) by discontinued operations                 0 0 0
Net Cash Provided by Operating Activities                 66 (810) (775)
Cash Flows from Investing Activities                      
Intercompany dividends                 2,513 2,006 1,665
Payments for acquisitions of businesses                 0 0 0
Capital expenditures                 (37) (45) (31)
Net proceeds from sale of emission allowances                 0 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                 893 1,542 343
Deconsolidation of Agua Caliente and Ivanpah projects                   0  
Changes in investments in unconsolidated affiliates                 0 0 0
Net contributions to discontinued operations                 0 0 150
Other                 6 (6) 0
Cash provided by continuing operations                 3,375 3,497 2,127
Cash used by discontinued operations                 0 0 0
Net Cash Provided/(Used) by Investing Activities                 3,375 3,497 2,127
Cash Flows from Financing Activities                      
Intercompany dividends and transfers                 (1,548) (825) (214)
Payments of dividends to common stockholders                 (32) (37) (38)
Payment for preferred shares                 (1,440) (1,250)  
Payments for debt extinguishment costs                 (26) (32) (42)
Net distributions to redeemable noncontrolling interests from subsidiaries                 0 0 0
Proceeds/(payments) from issuance of common stock                 3 21 (2)
Proceeds from issuance of long-term debt                 1,916 937 1,084
Payments of debt issuance costs                 (35) (19) (16)
Payments for short and long-term debt                 (2,432) (1,596) (1,701)
Receivable from affiliate                   (26) (125)
Other                 0 0 0
Cash used by continuing operations                 (3,594) (2,827) (1,054)
Cash provided/(used) by discontinued operations                 0 0 0
Net Cash (Used)/Provided by Financing Activities                 (3,594) (2,827) (1,054)
Effect of exchange rate changes on cash and cash equivalents                   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                 (153) (140) 298
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at End of Period $ 327       $ 480       327 480 620
Cash and Cash Equivalents, Funds Deposited by Counterparties and Restricted Cash at Beginning of Period       $ 480       $ 620 $ 480 $ 620 $ 322