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Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Other Balance Sheet Information

The following table presents the allowance for doubtful accounts included in accounts receivable, net; accumulated depreciation included in property, plant and equipment, net; accumulated amortization included in intangible assets, net and accumulated amortization included in out-of-market contracts, net:

	September 30, 2018				December 31, 2017
	(In millions)
Accounts receivable allowance for doubtful accounts	$	37			$	28
Property, plant and equipment accumulated depreciation	2,652				3,013
Intangible assets accumulated amortization	1,194				1,572
Out-of-market contracts accumulated amortization	372				354

Reconciliation of Cash and Cash Equivalents, Restricted Cash and Funds Deposited by Counterparties

The following table provides a reconciliation of cash and cash equivalents, restricted cash and funds deposited by counterparties reported within the consolidated balance sheet that sum to the total of the same such amounts shown in the statement of cash flows.

	September 30, 2018				December 31, 2017				September 30, 2017				December 31, 2016
	(In millions)
Cash and cash equivalents	$	1,359			$	767			$	1,022			$	591
Funds deposited by counterparties	30				37				31				2
Restricted cash	28				279				318				267
Cash and cash equivalents, funds deposited by counterparties and restricted cash shown in the statement of cash flows	$	1,417			$	1,083			$	1,371			$	860

Schedule of Changes in Noncontrolling Interest

Noncontrolling Interest

The following table reflects the changes in NRG's noncontrolling interest balance:

	(In millions)
Balance as of December 31, 2017	$	2,314
Dividends paid to NRG Yield, Inc. public shareholders	(61		)
Distributions to noncontrolling interest	(43		)
Net income attributable to noncontrolling interest - continuing operations	5
Net income attributable to noncontrolling interest - discontinued operations	21
Other comprehensive income attributable to noncontrolling interest - discontinued operations	14
Non-cash adjustments to noncontrolling interest	10
Contributions from noncontrolling interest	296
Sale of assets to NRG Yield, Inc.	(8		)
Deconsolidation of Ivanpah(a)	(89		)
Deconsolidation of Agua Caliente(b)	(279		)
Deconsolidation of NRG Yield and the Renewables Platform(b)	(2,180		)
Balance as of September 30, 2018	$	—

(a) See Note 9, Variable Interest Entities, or VIEs for further information regarding the deconsolidation of Ivanpah effective April 2018.

(b) See Note 3, Acquisitions, Discontinued Operations and Dispositions for further information regarding the sale of NRG Yield and the Renewables Platform and the deconsolidation of Agua Caliente.

Redeemable Noncontrolling Interest

Redeemable Noncontrolling Interest

The following table reflects the changes in the Company's redeemable noncontrolling interest balance:

	(In millions)
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	(9		)
Net income attributable to redeemable noncontrolling interest - continuing operations	1
Net income attributable to redeemable noncontrolling interest - discontinued operations	(26		)
Deconsolidation of NRG Yield and the Renewables Platform(a)	(48		)
Balance as of September 30, 2018	$	19

(a) See Note 3, Acquisitions, Discontinued Operations and Dispositions for further information regarding the sale of NRG Yield and the Renewables Platform.

Disaggregation of Revenue from Contracts

The following table represents the Company’s disaggregation of revenue from contracts with customers for the three and nine months ended September 30, 2018, along with the reportable segment for each category:

	Three months ended September 30, 2018
					Generation
(In millions)	Retail				Gulf Coast				East/West/Other				Subtotal				Corporate/Eliminations				Total
Energy revenue(a)	$	—			$	680			$	278			$	958			$	(479	)		$	479
Capacity revenue(a)	—				66				187				253				1				254
Retail revenue
Mass customers	1,768				—				—				—				(2		)		1,766
Business Solutions customers	434				—				—				—				—				434
Total retail revenue	2,202				—				—				—				(2		)		2,200
Mark-to-market for economic hedging activities(b)	1				268				27				295				(241		)		55
Contract amortization	—				5				—				5				—				5
Other revenue(a)(c)	—				36				32				68				—				68
Total operating revenue	2,203				1,055				524				1,579				(721		)		3,061
Less: Lease revenue	3				—				3				3				—				6
Less: Derivative revenue	1				1,160				55				1,215				(241		)		975
Less: Contract amortization	—				5				—				5				—				5
Total revenue from contracts with customers	$	2,199			$	(110	)		$	466			$	356			$	(480	)		$	2,075
(a) The following amounts of energy and capacity revenue relate to derivative instruments and are accounted for under ASC 815.
	Retail				Gulf Coast				East/West/Other				Subtotal				Corporate/Eliminations				Total
Energy revenue	$	—			$	896			$	(25	)		$	871			$	—			$	871
Capacity revenue	—				—				45				45				—				45
Other revenue	—				(4		)		8				4				—				4

(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 $3 million for both Retail and East/West/Other, respectively.

	Nine months ended September 30, 2018
					Generation
(In millions)	Retail				Gulf Coast					East/West/Other					Subtotal				Corporate/Eliminations				Total
Energy revenue(a)	$	—			$	1,558				$	735				$	2,293			$	(890	)		$	1,403
Capacity revenue(a)	—				201			—		487			—		688				—				688
Retail revenue
Mass customers	4,321				—					—					—				(4		)		4,317
Business Solutions customers	1,181				—					—					—				—				1,181
Total retail revenue	5,502				—					—					—				(4		)		5,498
Mark-to-market for economic hedging activities(b)	(5		)		(7		)			2					(5		)		(21		)		(31		)
Contract amortization	—				12					—					12				—				12
Other revenue(c)	—				164					64					228				(3		)		225
Total operating revenue	5,497				1,928					1,288					3,216				(918		)		7,795
Less: Lease revenue	10				—					6					6				—				16
Less: Derivative revenue	(5		)		1,871					135					2,006				—				2,001
Less: Contract amortization	—				12					—					12				—				12
Total revenue from contracts with customers	$	5,492			$	45				$	1,147				$	1,192			$	(918	)		$	5,766
(a) The following amounts of energy and capacity revenue relate to derivative instruments and are accounted for under ASC 815.
	Retail				Gulf Coast					East/West/Other					Subtotal				Corporate/Eliminations				Total
Energy revenue	$	—			$	1,877				$	7				$	1,884			$	—			$	1,884
Capacity revenue	—				—					110					110				—				110
Other revenue	—				1					16					17				—				17

(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 $10 million and $6 million for Retail and East/West/Other, respectively.

Contract Asset and Liabilities

The following table reflects the contract assets and liabilities included in the Company’s balance sheet as of September 30, 2018:

(In millions)		September 30, 2018
Deferred customer acquisition costs		$	104
Accounts receivable, net - Contracts with customers		1,265
Accounts receivable, net - Derivative instruments		32
Total accounts receivable, net		$	1,297
Unbilled revenues (included within Accounts receivable, net - Contracts with customers)		385
Deferred revenues		60

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