Derivative Instruments and Hedging Activities - Schedule of Fair Value Within the Derivative Instrument Valuation on the Balance Sheets (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 135	$ 175
Derivative Liabilities	374	371
Derivatives Designated as Cash Flow Hedges:
Derivatives, Fair Value [Line Items]
Derivative Assets	18	27
Derivative Liabilities	35	0
Derivatives Not Designated as Cash Flow Hedges:
Derivatives, Fair Value [Line Items]
Derivative Assets	117	148
Derivative Liabilities	339	371
Interest rate contracts current \| Derivatives Designated as Cash Flow Hedges:
Derivatives, Fair Value [Line Items]
Derivative Assets	3	5
Derivative Liabilities	3	0
Interest rate contracts current \| Derivatives Not Designated as Cash Flow Hedges:
Derivatives, Fair Value [Line Items]
Derivative Assets	13	30
Derivative Liabilities	2	0
Interest rate contracts long-term \| Derivatives Designated as Cash Flow Hedges:
Derivatives, Fair Value [Line Items]
Derivative Assets	15	22
Derivative Liabilities	32	0
Interest rate contracts long-term \| Derivatives Not Designated as Cash Flow Hedges:
Derivatives, Fair Value [Line Items]
Derivative Assets	92	109
Derivative Liabilities	0	0
Energy-related commodity contracts current \| Derivatives Not Designated as Cash Flow Hedges:
Derivatives, Fair Value [Line Items]
Derivative Assets	6	4
Derivative Liabilities	50	56
Energy-related commodity contracts long-term \| Derivatives Not Designated as Cash Flow Hedges:
Derivatives, Fair Value [Line Items]
Derivative Assets	6	5
Derivative Liabilities	$ 287	$ 315

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

+ References + Details

Clearway Energy, Inc. 10-Q