Long-term Debt - Narrative (Details) - USD ($) $ in Millions								1 Months Ended	3 Months Ended		4 Months Ended		6 Months Ended
	Jun. 25, 2026	May 01, 2026	Mar. 27, 2026	Feb. 27, 2026	Feb. 05, 2026	Jan. 15, 2026	Jan. 13, 2026	Jan. 31, 2026	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Apr. 30, 2026	Jun. 30, 2026	Jun. 30, 2025	Jun. 10, 2026	Apr. 27, 2026	Mar. 30, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Total debt									$ 9,137		$ 9,137		$ 9,137					$ 8,674
Proceeds from the revolving credit facility													60	$ 112
Weighted average remaining contract duration (in years)			15 years
Other non-current liabilities									753		753		753					676
Repayment of outstanding loan													647	498
Debt issuance costs									80		80		80					70
Capital expenditures									47	$ 51			129	$ 89
Restricted cash									292		292		292					$ 587
Cash Distribution
Debt Instrument [Line Items]
Restricted cash						$ 51			32		32		32
Elbow Creek Restructuring
Debt Instrument [Line Items]
Total debt	$ 34
Derecognized derivative liabilities with fair value	46
Other non-current liabilities	8
Repayment of outstanding loan	20
Total payments	$ 40
Effective interest rate (as a percentage)	5.493%
Langford Restructuring
Debt Instrument [Line Items]
Total debt															$ 62
Derecognized derivative liabilities with fair value															62
Total payments															$ 75
Effective interest rate (as a percentage)															5.749%
Mesquite Sky Restructuring
Debt Instrument [Line Items]
Total debt			$ 127
Derecognized derivative liabilities with fair value			115
Other non-current liabilities			12
Total payments			$ 162
Effective interest rate (as a percentage)			5.436%
Cardinal Portfolio
Debt Instrument [Line Items]
Borrowings																	$ 100
Early partial repayment																$ 17
Honeycomb Portfolio BESS
Debt Instrument [Line Items]
Payments for other fees		$ 13
Honeycomb Portfolio BESS | CEG
Debt Instrument [Line Items]
Remaining distributed amount		67
Goat Mountain Repowering
Debt Instrument [Line Items]
Proceeds from the revolving credit facility				$ 140
Debt instrument, basis spread on variable rate (as a percentage)				1.50%
Long-term debt				$ 703
Long-term debt, additions											231
Debt instrument, term (in years)				5 years
Remaining balance to distribute				$ 88
Debt issuance costs				15
Capital expenditures				$ 5
Honeycomb TE Holdco LLC | Honeycomb Portfolio BESS
Debt Instrument [Line Items]
Payments for asset acquisition, additional purchase price		81
Payments for asset acquisition		97
2034 Senior Notes
Debt Instrument [Line Items]
Proceeds from the revolving credit facility							$ 600
Interest rate (as a percentage)							5.75%
Repayments of outstanding borrowings							$ 361
Revolving Credit Facility
Debt Instrument [Line Items]
Total debt									198		198		198
Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding									$ 1,340		$ 1,340		$ 1,340
Letter of Credit | Cardinal Portfolio
Debt Instrument [Line Items]
Borrowings					$ 119
Term Loan | Cardinal Portfolio
Debt Instrument [Line Items]
Borrowings					$ 100
Debt instrument, basis spread on variable rate (as a percentage)					2.00%
Tax Equity Investor | Honeycomb Portfolio BESS
Debt Instrument [Line Items]
Long-term debt		254
Proceeds from noncontrolling interests		60
Tax Equity Bridge Loan | Honeycomb Portfolio BESS
Debt Instrument [Line Items]
Long-term debt		234
Construction loans | Honeycomb Portfolio BESS
Debt Instrument [Line Items]
Long-term debt, additions												$ 71
Construction Loan | Honeycomb Portfolio BESS
Debt Instrument [Line Items]
Long-term debt, additions		$ 327
Tax Credit Transfer Bridge Loan | Pine Forest Drop Down
Debt Instrument [Line Items]
Repayment of outstanding loan						$ 231		$ 231