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Earnings Per Share - Schedule of Reconciliation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Basic income per share attributable to Clearway Energy, Inc. common stockholders
Net income attributable to Clearway Energy, Inc.	$ 32	$ 39	$ 50	$ (5)
Common Class A
Basic income per share attributable to Clearway Energy, Inc. common stockholders
Net income attributable to Clearway Energy, Inc.	$ 9	$ 12	$ 15	$ (2)
Weighted average number of common shares outstanding - basic (in shares)	35	35
Loss per weighted average common share - basic (in dollars per share)	$ 0.27	$ 0.36	$ 0.43	$ (0.04)
Net income attributable to Clearway Energy, Inc	$ 9	$ 12
Weighted average number of Class C common shares outstanding - diluted (in shares)	35	35
Earnings per weighted average common share — diluted (in dollars per share)	$ 0.27	$ 0.36
Weighted average number of Class A and Class C common shares outstanding - basic and diluted (in shares)	35	35	35	35
Earnings (loss) per weighted average common share — basic and diluted (in dollars per share)			$ 0.43	$ (0.04)
Common Class C
Basic income per share attributable to Clearway Energy, Inc. common stockholders
Net income attributable to Clearway Energy, Inc.	$ 22	$ 27	$ 35	$ (3)
Weighted average number of common shares outstanding - basic (in shares)	81	73	80	73
Loss per weighted average common share - basic (in dollars per share)	$ 0.27	$ 0.36	$ 0.43	$ (0.04)
Net income attributable to Clearway Energy, Inc	$ 22	$ 27
Weighted average number of Class C common shares outstanding - diluted (in shares)	81	75	80	73
Earnings per weighted average common share — diluted (in dollars per share)	$ 0.27	$ 0.36
Weighted average number of Class A and Class C common shares outstanding - basic and diluted (in shares)			80	73
Earnings (loss) per weighted average common share — basic and diluted (in dollars per share)			$ 0.43	$ (0.04)

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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