Condensed Consolidating Financial Information - CONSOLIDATING BALANCE SHEETS (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Current Assets
Cash and cash equivalents	$ 759	$ 345
Funds deposited by counterparties	51	32
Restricted cash	8	8
Accounts receivable, net	915	1,025
Inventory	372	383
Derivative instruments	884	860
Cash collateral paid in support of energy risk management activities	200	190
Prepayments and other current assets	290	245
Total current assets	3,479	3,088
Property, plant and equipment, net	2,573	2,593
Other Assets
Investment in subsidiaries	0	0
Equity investments in affiliates	350	388
Operating lease right-of-use assets, net	446	464
Goodwill	579	579
Intangible assets, net	769	789
Nuclear decommissioning trust fund	702	794
Derivative instruments	434	310
Deferred income taxes	3,265	3,286
Other non-current assets	225	240
Total other assets	6,770	6,850
Total Assets	12,822	12,531
Current Liabilities
Current portion of long-term debt	640	88
Current portion of operating lease liabilities	71	73
Accounts payable	708	722
Derivative instruments	832	781
Cash collateral received in support of energy risk management activities	51	32
Accrued expenses and other current liabilities	550	663
Total current liabilities	2,852	2,359
Other Liabilities
Long-term debt	5,807	5,803
Non-current operating lease liabilities	473	483
Nuclear decommissioning reserve	303	298
Nuclear decommissioning trust liability	390	487
Derivative instruments	370	322
Deferred income taxes	15	17
Other non-current liabilities	1,076	1,084
Total other liabilities	8,434	8,494
Total Liabilities	11,286	10,853
Redeemable noncontrolling interest in subsidiaries	0	20
Total Stockholders' Equity	1,536	1,658	$ (1,538)	$ (1,234)
Total Liabilities and Stockholders' Equity	12,822	12,531
Eliminations
Current Assets
Cash and cash equivalents	0	0
Funds deposited by counterparties	0	0
Restricted cash	0	0
Accounts receivable, net	(1,439)	(740)
Inventory	0	0
Derivative instruments	(33)	(41)
Cash collateral paid in support of energy risk management activities	0	0
Prepayments and other current assets	0	0
Total current assets	(1,472)	(781)
Property, plant and equipment, net	0	0
Other Assets
Investment in subsidiaries	(5,280)	(5,495)
Equity investments in affiliates	0	0
Operating lease right-of-use assets, net	0	0
Goodwill	0	0
Intangible assets, net	0	0
Nuclear decommissioning trust fund	0	0
Derivative instruments	(13)	(13)
Deferred income taxes	0	0
Other non-current assets	0	0
Total other assets	(5,293)	(5,508)
Total Assets	(6,765)	(6,289)
Current Liabilities
Current portion of long-term debt	0	0
Current portion of operating lease liabilities	0	0
Accounts payable	(1,439)	(740)
Derivative instruments	(33)	(41)
Cash collateral received in support of energy risk management activities	0	0
Accrued expenses and other current liabilities	0	0
Total current liabilities	(1,472)	(781)
Other Liabilities
Long-term debt	0	0
Non-current operating lease liabilities	0	0
Nuclear decommissioning reserve	0	0
Nuclear decommissioning trust liability	0	0
Derivative instruments	(13)	(13)
Deferred income taxes	0	0
Other non-current liabilities	0	0
Total other liabilities	(13)	(13)
Total Liabilities	(1,485)	(794)
Redeemable noncontrolling interest in subsidiaries		0
Total Stockholders' Equity	(5,280)	(5,495)
Total Liabilities and Stockholders' Equity	(6,765)	(6,289)
Guarantor Subsidiaries
Current Assets
Cash and cash equivalents	0	0
Funds deposited by counterparties	51	32
Restricted cash	7	5
Accounts receivable, net	1,684	1,293
Inventory	287	272
Derivative instruments	882	856
Cash collateral paid in support of energy risk management activities	197	182
Prepayments and other current assets	222	170
Total current assets	3,330	2,810
Property, plant and equipment, net	1,372	1,483
Other Assets
Investment in subsidiaries	158	710
Equity investments in affiliates	0	0
Operating lease right-of-use assets, net	79	81
Goodwill	400	359
Intangible assets, net	729	375
Nuclear decommissioning trust fund	702	794
Derivative instruments	434	308
Deferred income taxes	435	421
Other non-current assets	163	145
Total other assets	3,100	3,193
Total Assets	7,802	7,486
Current Liabilities
Current portion of long-term debt	1	0
Current portion of operating lease liabilities	20	20
Accounts payable	1,016	918
Derivative instruments	852	797
Cash collateral received in support of energy risk management activities	51	32
Accrued expenses and other current liabilities	259	280
Total current liabilities	2,199	2,047
Other Liabilities
Long-term debt	248	302
Non-current operating lease liabilities	64	64
Nuclear decommissioning reserve	303	298
Nuclear decommissioning trust liability	390	487
Derivative instruments	382	334
Deferred income taxes	0	0
Other non-current liabilities	438	399
Total other liabilities	1,825	1,884
Total Liabilities	4,024	3,931
Redeemable noncontrolling interest in subsidiaries		0
Total Stockholders' Equity	3,778	3,555
Total Liabilities and Stockholders' Equity	7,802	7,486
Non-Guarantor Subsidiaries
Current Assets
Cash and cash equivalents	19	20
Funds deposited by counterparties	0	0
Restricted cash	0	1
Accounts receivable, net	137	239
Inventory	85	111
Derivative instruments	35	45
Cash collateral paid in support of energy risk management activities	3	8
Prepayments and other current assets	8	8
Total current assets	287	432
Property, plant and equipment, net	1,046	952
Other Assets
Investment in subsidiaries	0	0
Equity investments in affiliates	350	388
Operating lease right-of-use assets, net	251	261
Goodwill	179	220
Intangible assets, net	40	414
Nuclear decommissioning trust fund	0	0
Derivative instruments	13	15
Deferred income taxes	(32)	(19)
Other non-current assets	27	30
Total other assets	828	1,309
Total Assets	2,161	2,693
Current Liabilities
Current portion of long-term debt	4	5
Current portion of operating lease liabilities	31	32
Accounts payable	125	141
Derivative instruments	13	25
Cash collateral received in support of energy risk management activities	0	0
Accrued expenses and other current liabilities	31	44
Total current liabilities	204	247
Other Liabilities
Long-term debt	24	28
Non-current operating lease liabilities	295	301
Nuclear decommissioning reserve	0	0
Nuclear decommissioning trust liability	0	0
Derivative instruments	1	1
Deferred income taxes	15	17
Other non-current liabilities	120	153
Total other liabilities	455	500
Total Liabilities	659	747
Redeemable noncontrolling interest in subsidiaries		20
Total Stockholders' Equity	1,502	1,926
Total Liabilities and Stockholders' Equity	2,161	2,693
NRG Energy, Inc. (Note Issuer)
Current Assets
Cash and cash equivalents	740	325
Funds deposited by counterparties	0	0
Restricted cash	1	2
Accounts receivable, net	533	233
Inventory	0	0
Derivative instruments	0	0
Cash collateral paid in support of energy risk management activities	0	0
Prepayments and other current assets	60	67
Total current assets	1,334	627
Property, plant and equipment, net	155	158
Other Assets
Investment in subsidiaries	5,122	4,785
Equity investments in affiliates	0	0
Operating lease right-of-use assets, net	116	122
Goodwill	0	0
Intangible assets, net	0	0
Nuclear decommissioning trust fund	0	0
Derivative instruments	0	0
Deferred income taxes	2,862	2,884
Other non-current assets	35	65
Total other assets	8,135	7,856
Total Assets	9,624	8,641
Current Liabilities
Current portion of long-term debt	635	83
Current portion of operating lease liabilities	20	21
Accounts payable	1,006	403
Derivative instruments	0	0
Cash collateral received in support of energy risk management activities	0	0
Accrued expenses and other current liabilities	260	339
Total current liabilities	1,921	846
Other Liabilities
Long-term debt	5,535	5,473
Non-current operating lease liabilities	114	118
Nuclear decommissioning reserve	0	0
Nuclear decommissioning trust liability	0	0
Derivative instruments	0	0
Deferred income taxes	0	0
Other non-current liabilities	518	532
Total other liabilities	6,167	6,123
Total Liabilities	8,088	6,969
Redeemable noncontrolling interest in subsidiaries		0
Total Stockholders' Equity	1,536	1,672
Total Liabilities and Stockholders' Equity	$ 9,624	$ 8,641

The amount of cash collateral received from hedge counterparties in support of energy risk management activities for which there is an offsetting liability within current liabilities. These amounts are segregated into separate accounts that are not contractually restricted but, based on the entity's intention, are not available for the payment of the entity's general corporate obligations. Depending on market fluctuations and the settlement of the underlying contracts, the entity will refund this collateral to the counterparties pursuant to the terms and conditions of the underlying trades.

No definition available.