Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2018

Schedule of Accumulated Depreciation and Amortization [Table Text Block]

The following table presents the accumulated depreciation included in the property, plant and equipment, net, and accumulated amortization included in intangible assets, net, respectively, as of September 30, 2018 and December 31, 2017:



	September 30, 2018		December 31, 2017
	(In millions)
Property, Plant and Equipment Accumulated Depreciation	$	1,507	$	1,285
Intangible Assets Accumulated Amortization	289		237

Schedule of Change in Noncontrolling Interest [Table Text Block]

The following table reflects the changes in the Company's noncontrolling interest balance for the period from January 1, 2018 through September 30, 2018:



	(In millions)
Balance as of December 31, 2017 as previously reported ^(a)	$	391
Net Assets of Buckthorn Solar Drop Down Asset as of December 31, 2017	21
Balance as of December 31, 2017 as recast	$	412
Capital contributions from tax equity investors, net of distributions ^(b)	108
Comprehensive income	41
Distributions to NRG, net ^(c)	(62		)
Non cash distributions to NRG in connection with the UPMC Thermal Project Asset Acquisition	(12		)
Payment for the Buckthorn Solar Drop Down Asset	(42		)
Net distributions to CEG ^(d)	(9		)
Pre-acquisition net income of the Buckthorn Solar Drop Down Asset	4
Balance as of September 30, 2018	$	440

Distributions Made to Limited Liability Company (LLC) Member, by Distribution [Table Text Block]

The following table lists the distributions paid to NRG during the period from January 1, 2018 through August 31, 2018 and to CEG during the period from September 1, 2018 through September 30, 2018 on Clearway Energy LLC's Class B and D units:



	Third Quarter 2018		Second Quarter 2018		First Quarter 2018
Distributions per Class B Unit	$	0.320	$	0.309	$	0.298
Distributions per Class D Unit	$	0.320	$	0.309	$	0.298

Disaggregation of Revenue [Table Text Block]

The following tables represent 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
(In millions)	Conventional Generation			Renewables			Thermal			Total
Energy revenue^(a)	$	2		$	167		$	50		$	219
Capacity revenue^(a)	86			—			4			90
Contract amortization	(1		)	(15		)	(1		)	(17		)
Total operating revenue	87			152			53			292
Less: Lease revenue	(88		)	(158		)	—			(246		)
Less: Contract amortization	1			15			1			17
Total revenue from contracts with customers	$	—		$	9		$	54		$	63

^(a)The following amounts of energy and capacity revenue relate to leases and are accounted for under ASC 840:



	Conventional Generation		Renewables		Total
Energy Revenue	$	2	$	158	$	160
Capacity Revenue	86		—		86
	88		158		246



	Nine months ended September 30, 2018
(In millions)	Conventional Generation			Renewables			Thermal			Total
Energy revenue^(b)	$	5		$	473		$	139		$	617
Capacity revenue^(b)	250			—			9			259
Contract amortization	(4		)	(46		)	(2		)	(52		)
Total operating revenue	251			427			146			824
Less: Lease revenue	(255		)	(438		)	(1		)	(694		)
Less: Contract amortization	4			46			2			52
Total revenue from contracts with customers	$	—		$	35		$	147		$	182

^(b)The following amounts of energy and capacity revenue relate to leases and are accounted for under ASC 840:



	Conventional Generation		Renewables		Thermal		Total
Energy Revenue	$	5	$	438	$	1	$	444
Capacity Revenue	250		—		—		250
	255		438		1		694

Contract with Customer, Asset and Liability [Table Text Block]

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



(In millions)	September 30, 2018
Accounts receivable, net - Contracts with customers	$	35
Accounts receivable, net - Leases	106
Total accounts receivable, net	$	141