Derivative Instruments and Hedging Activities - Schedule of Derivative Instruments, Gain (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Interest Rate Contracts (Interest expense)
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) on derivatives, net of tax	$ (8)	$ (57)	$ (40)	$ (33)
Energy-Related Commodity Contracts (Mark-to-market for economic hedging activities included in Total operating revenues)
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) on derivatives, net of tax	(4)	72	(25)	11
Energy-Related Commodity Contracts (Mark-to-market for economic hedging activities included in Cost of operations)
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized gain (loss) on derivatives, net of tax	$ (1)	$ 0	$ (1)	$ (3)

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References + Details

Clearway Energy LLC 10-Q