v3.26.1
Derivative Instruments and Hedging Activities - Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Mark-to-market of cash flow hedge accounting contracts $ 22 $ (17) $ 33 $ (23)
Accumulated OCI (OCL) ending balance   5,568   5,568
Gains expected to be realized from OCI during the next 12 months 6 6
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Accumulated OCI (OCL) beginning balance 5 5 (6) 15
Accumulated OCI (OCL) ending balance 27 (21) 27 (21)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Reclassified from accumulated OCI/OCL to income due to realization of previously deferred amounts 1 0 2 0
Mark-to-market of cash flow hedge accounting contracts 21 (17) 31 (23)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | Rosamond South I Drop Down        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Drop Down 0 0 0 (4)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | Daggett 1 Drop Down        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Drop Down 0 (6) 0 (6)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | Luna Valley Drop Down        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Drop Down 0 (8) 0 (8)
Accumulated Foreign Currency Adjustment Including Portion Attributable to Noncontrolling Interest | Pine Forest Drop Down        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Drop Down 0 5 0 5
Accumulated OCI attributable to noncontrolling interests        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Accumulated OCI (OCL) ending balance 7 3 7 3
Accumulated OCI (OCL) attributable to Clearway Energy LLC        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Accumulated OCI (OCL) ending balance $ 20 (24) 20 (24)
Clearway Energy LLC | Rosamond South I Drop Down        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Drop Down     2  
Noncontrolling Interest        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Accumulated OCI (OCL) ending balance   $ 4,162   $ 4,162
Noncontrolling Interest | Rosamond South I Drop Down        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Drop Down     $ 2