Schedule I - Condensed Financial Information of Registrant Condensed Financial Information of Registrant B/S (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016	Dec. 31, 2015
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	$ 407	$ 148	[1]	$ 322
Notes receivable — current	0	13	[1]
Deferred income taxes	57	128	[1]
Total Assets	8,500	8,489	[1]
Less current maturities	535	339	[1]
Accounts payable — affiliate	19	49	[1]
Long-term debt	6,044	6,083
Other non-current liabilities	108	100	[1]
Total Liabilities	6,276	6,330	[1]
Preferred stock, $0.01 par value; 10,000,000 shares authorized; none issued	0	0	[1]
Common Stock, Value, Issued	1	1	[1]
Additional paid-in capital	1,897	1,843	[1]
Accumulated deficit	(58)	(69)	[1]
Accumulated other comprehensive loss	(18)	(28)	[1]	(28)
Noncontrolling interest	402	412	[1]
Total Stockholders' Equity	2,224	2,159	[1]	2,624	$ 2,903
Total Liabilities and Stockholders' Equity	8,500	8,489	[1]
Clearway Energy, Inc.
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	0	2		$ 1	$ 1
Notes receivable — current	215	0
Investment in consolidated subsidiaries	2,182	2,029
Note receivable - Clearway Energy Operating LLC	44	618
Deferred income taxes	57	128
Total Assets	2,498	2,777
Less current maturities	220	0
Accounts payable — affiliate	5	0
Other current liabilities	0	2
Long-term debt	44	610
Other non-current liabilities	5	6
Total Liabilities	274	618
Preferred stock, $0.01 par value; 10,000,000 shares authorized; none issued	0	0
Common Stock, Value, Issued	1	1
Additional paid-in capital	1,897	1,843
Accumulated deficit	(58)	(69)
Accumulated other comprehensive loss	(18)	(28)
Noncontrolling interest	402	412
Total Stockholders' Equity	2,224	2,159
Total Liabilities and Stockholders' Equity	$ 2,498	$ 2,777

[1] Retrospectively adjusted as discussed in Note 1, Nature of Business.