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Long-term Debt - Schedule of Debt (Details) - USD ($)
$ in Millions
1 Months Ended 9 Months Ended
Oct. 31, 2025
Sep. 30, 2025
Dec. 31, 2024
Debt Instrument [Line Items]      
Total debt   $ 8,490 $ 7,235
Less current maturities   (342) (430)
Less net debt issuance costs   (66) (57)
Add premiums   2 2
Total long-term debt   8,084 6,750
Senior Notes      
Debt Instrument [Line Items]      
Total debt   $ 2,125 2,125
Senior Notes | Minimum      
Debt Instrument [Line Items]      
Interest rate, percentage   3.75%  
Senior Notes | Maximum      
Debt Instrument [Line Items]      
Interest rate, percentage   4.75%  
Clearway Energy LLC and Clearway Energy Operating LLC Revolving Credit Facility, due 2028      
Debt Instrument [Line Items]      
Total debt   $ 405 0
Basis spread on variable rate   1.75%  
Clearway Energy LLC and Clearway Energy Operating LLC Revolving Credit Facility, due 2028 | Subsequent Event      
Debt Instrument [Line Items]      
Total debt $ 215    
Repayments of outstanding borrowings $ 190    
Fixed Rate      
Debt Instrument [Line Items]      
Total debt   $ 3,055 3,190
Fixed Rate | Minimum      
Debt Instrument [Line Items]      
Basis spread on fixed rate   2.339%  
Fixed Rate | Maximum      
Debt Instrument [Line Items]      
Basis spread on fixed rate   8.00%  
Variable Rate      
Debt Instrument [Line Items]      
Total debt   $ 2,905 $ 1,920
Variable Rate | Minimum      
Debt Instrument [Line Items]      
Basis spread on variable rate   1.475%  
Variable Rate | Maximum      
Debt Instrument [Line Items]      
Basis spread on variable rate   2.775%