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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]  
Net Income/(Loss) Attributable to Continuing and Discontinued Operations
The following table reflects the net income/(loss) attributable to NRG Energy, Inc. after removing the net loss attributable to the noncontrolling interest and redeemable noncontrolling interest:
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
(In millions)
Income/(loss) from continuing operations, net of income tax
$
465

 
$
(977
)
 
$
(733
)
Loss from discontinued operations, net of income tax
(197
)
 
(1,176
)
 
(41
)
Net income/(loss) attributable to NRG Energy, Inc. stockholders
$
268

 
$
(2,153
)
 
(774
)
Reconciliation of Cash and Cash Equivalents, Restricted Cash and Funds Deposited to Cash Flow
The following table provides a reconciliation of cash and cash equivalents, restricted cash and funds deposited by counterparties reported within the consolidated balance sheets that sum to the total of the same such amounts shown in the statements of cash flows.
 
Year Ended December 31,
 
2018
 
2017
 
2016
 
(In millions)
Cash and cash equivalents
$
563

 
$
770

 
$
591

Funds deposited by counterparties
33

 
37

 
2

Restricted cash
17

 
279

 
267

Cash and cash equivalents, funds deposited by counterparties and restricted cash shown in the statements of cash flows
$
613

 
$
1,086

 
$
860
Disaggregation of Revenue
The following table represents the Company’s disaggregation of revenue from contracts with customers for the year ended December 31, 2018, along with the reportable segment for each category:
 
For the Year Ended December 31, 2018
 
 
 
Generation
 
 
 
 
(In millions)
Retail
 
Texas
 
East/West/Other
 
Subtotal
 
Corporate/Eliminations
 
Total
Energy revenue(a)
$
—

 
$
1,585

 
$
1,092

 
$
2,677

 
$
(1,129
)
 
$
1,548

Capacity revenue(a)
—

 
1

 
669

 
670

 
—

 
670

Retail revenue
 
 
 
 
 
 
 
 
 
 
 
Mass customers
5,618

 
—

 
—

 
—

 
(5
)
 
5,613

Business Solutions customers
1,492

 
—

 
—

 
—

 
—

 
1,492

Total retail revenue
7,110

 
—

 
—

 
—

 
(5
)
 
7,105

Mark-to-market for economic hedging activities(b)
(7
)
 
(174
)
 
(28
)
 
(202
)
 
79

 
(130
)
Other revenue(a)(c)
—

 
84

 
203

 
287

 
(2
)
 
285

Total operating revenue
7,103

 
1,496

 
1,936

 
3,432

 
(1,057
)
 
9,478

Less: Lease revenue
13

 
—

 
8

 
8

 
—

 
21

Less: Derivative revenue
(7
)
 
2,160

 
193

 
2,353

 
(1,037
)
 
1,309

Total revenue from contracts with customers
$
7,097

 
$
(664
)
 
$
1,735

 
$
1,071

 
$
(20
)
 
$
8,148

(a) The following amounts of energy, capacity and other revenue relate to derivative instruments and are accounted for under ASC 815:
 
Retail
 
Texas
 
East/West/Other
 
Subtotal
 
Corporate/Eliminations
 
Total
Energy revenue
$
—

 
$
2,332

 
$
69

 
$
2,401

 
$
(1,117
)
 
$
1,284

Capacity revenue
—

 
—

 
138

 
138

 
—

 
138

Other revenue
—

 
2

 
14

 
16

 
—

 
16

(b) Revenue relates entirely to unrealized gains and losses on derivative instruments accounted for under ASC 815
(c) Included in other revenue is lease revenue of $17 million and $5 million for Retail and East/West/Other, respectively
Contract Assets and Liabilities
The following table reflects the contract assets and liabilities included in the Company's balance sheet as of December 31, 2018:
 
 
 
 
 
(In millions)
Deferred customer acquisition costs
 
$
111

 
 
 
Accounts receivable, net - Contracts with customers
 
1,002

Accounts receivable, net - Derivative instruments
 
20

Total accounts receivable, net
 
$
1,022

 
 
 
Unbilled revenues (included within Accounts receivable, net - Contracts with customers)
 
$
392

Deferred revenues
 
$
67
Changes in Redeemable Noncontrolling Interest
The following table reflects the changes in the Company's redeemable noncontrolling interest balance for the years ended December 31, 2018, 2017, and 2016.
 
(In millions)
Balance as of December 31, 2015
$
29

Distributions to redeemable noncontrolling interest
(1
)
Contributions from redeemable noncontrolling interest
33

Non-cash adjustments to redeemable noncontrolling interest
23

Comprehensive loss attributable to redeemable noncontrolling interest
(38
)
Balance as of December 31, 2016
46

Distributions to redeemable noncontrolling interest
(2
)
Contributions from redeemable noncontrolling interest
99

Non-cash adjustments to redeemable noncontrolling interest
7

Comprehensive loss attributable to redeemable noncontrolling interest
(72
)
Balance as of December 31, 2017
78

Distributions to redeemable noncontrolling interest
(3
)
Contributions from redeemable noncontrolling interest
26

Non-cash adjustments to redeemable noncontrolling interest
(8
)
Net income attributable to redeemable noncontrolling interest - continuing operations
1

Net loss attributable to redeemable noncontrolling interest - discontinued operations
(27
)
Sale of NRG Yield and the Renewables Platform(a)
(48
)
Balance as of December 31, 2018
$
19