v3.26.1
Long-term Debt and Finance Leases - Schedule of Long-term Debt and Finance Leases (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2026
Jan. 30, 2026
Dec. 31, 2025
Debt Instrument [Line Items]      
Long-term debt $ 23,392   $ 16,576
Finance leases 45   24
Subtotal long-term debt and finance leases (including current maturities) 23,437   16,600
Less current maturities (1,512)   (31)
Less debt issuance costs (177)   (146)
Discounts, net of premiums (4)   (11)
Total long-term debt and finance leases 21,744   16,412
Senior Notes, due 2034      
Debt Instrument [Line Items]      
Interest rate %   5.75%  
Recourse Debt      
Debt Instrument [Line Items]      
Long-term debt 21,673   16,576
Recourse Debt | Senior Notes, due 2028      
Debt Instrument [Line Items]      
Long-term debt $ 821   821
Interest rate % 5.75%    
Recourse Debt | Senior Notes, due 2029      
Debt Instrument [Line Items]      
Long-term debt $ 733   733
Interest rate % 5.25%    
Recourse Debt | Senior Notes, due 2029      
Debt Instrument [Line Items]      
Long-term debt $ 500   500
Interest rate % 3.375%    
Recourse Debt | Senior Notes, due 2029      
Debt Instrument [Line Items]      
Long-term debt $ 798   798
Interest rate % 5.75%    
Recourse Debt | Senior Notes, due 2031      
Debt Instrument [Line Items]      
Long-term debt $ 1,030   1,030
Interest rate % 3.625%    
Recourse Debt | Senior Notes, due 2032      
Debt Instrument [Line Items]      
Long-term debt $ 480   480
Interest rate % 3.875%    
Recourse Debt | Senior Notes, due 2033      
Debt Instrument [Line Items]      
Long-term debt $ 925   925
Interest rate % 6.00%    
Recourse Debt | Senior Notes, due 2034      
Debt Instrument [Line Items]      
Long-term debt $ 950   950
Interest rate % 6.25%    
Recourse Debt | Senior Notes, due 2034      
Debt Instrument [Line Items]      
Long-term debt $ 1,250   1,250
Interest rate % 5.75%    
Recourse Debt | Senior Notes, due 2034      
Debt Instrument [Line Items]      
Long-term debt $ 1,050   0
Interest rate % 5.875%    
Recourse Debt | Senior Notes, due 2036      
Debt Instrument [Line Items]      
Long-term debt $ 2,400   2,400
Interest rate % 6.00%    
Recourse Debt | Senior Notes, due 2036      
Debt Instrument [Line Items]      
Long-term debt $ 1,050   0
Interest rate % 6.125%    
Recourse Debt | Senior Secured First Lien Notes, due 2027      
Debt Instrument [Line Items]      
Long-term debt $ 900   900
Interest rate % 2.45%    
Recourse Debt | Senior Secured First Lien Notes, due 2029      
Debt Instrument [Line Items]      
Long-term debt $ 500   500
Interest rate % 4.45%    
Recourse Debt | Senior Secured First Lien Notes, due 2030      
Debt Instrument [Line Items]      
Long-term debt $ 625   625
Interest rate % 4.734%    
Recourse Debt | Senior Secured First Lien Notes, due 2031      
Debt Instrument [Line Items]      
Long-term debt $ 500   0
Interest rate % 4.955%    
Recourse Debt | Senior Secured First Lien Notes, due 2033      
Debt Instrument [Line Items]      
Long-term debt $ 740   740
Interest rate % 7.00%    
Recourse Debt | Senior Secured First Lien Notes, due 2035      
Debt Instrument [Line Items]      
Long-term debt $ 625   625
Interest rate % 5.407%    
Recourse Debt | Revolving Credit Facility | Revolving Credit Facility      
Debt Instrument [Line Items]      
Long-term debt $ 1,449   0
Basis spread on variable rate 1.72%    
Recourse Debt | Term Loan B, due 2031 | Revolving Credit Facility      
Debt Instrument [Line Items]      
Long-term debt $ 2,287   2,299
Basis spread on variable rate 1.75%    
Recourse Debt | Term Loan B, due 2033 | Revolving Credit Facility      
Debt Instrument [Line Items]      
Long-term debt $ 898   0
Basis spread on variable rate 1.75%    
Recourse Debt | Tax-exempt bonds      
Debt Instrument [Line Items]      
Long-term debt $ 466   466
Recourse Debt | Tax-exempt bonds | Minimum      
Debt Instrument [Line Items]      
Interest rate % 4.00%    
Recourse Debt | Tax-exempt bonds | Maximum      
Debt Instrument [Line Items]      
Interest rate % 4.75%    
Recourse Debt | T.H. Wharton TEF loan, due 2045      
Debt Instrument [Line Items]      
Long-term debt $ 216   189
Interest rate % 3.00%    
Recourse Debt | Cedar Bayou 5 TEF loan, due 2045      
Debt Instrument [Line Items]      
Long-term debt $ 334   255
Interest rate % 3.00%    
Recourse Debt | Greens Bayou 6 TEF loan, due 2045      
Debt Instrument [Line Items]      
Long-term debt $ 146   90
Interest rate % 3.00%    
Non Recourse Debt | Lightning Term Loan, due 2031      
Debt Instrument [Line Items]      
Long-term debt $ 1,719   0
Basis spread on variable rate 2.00%    
Non Recourse Debt | Subtotal all Lightning non-recourse debt      
Debt Instrument [Line Items]      
Long-term debt $ 1,719   $ 0