Leases (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2025		Sep. 30, 2024		Sep. 30, 2025		Sep. 30, 2024		Dec. 31, 2024
Lessee, Lease, Description [Line Items]
Operating Lease, Cost	$ 11		$ 13		$ 31		$ 41
Lessee, Operating Lease, Liability, to be Paid	414				414
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(69)				(69)
Operating Lease, Liability	345				345
Operating Lease, Liability, Current	(35)				(35)				$ (34)
Operating lease liabilities	310				310				$ 337
PPAs
Lessee, Lease, Description [Line Items]
Operating Lease, Cost	10		12		28		38
Lessee, Operating Lease, Liability, to be Paid	370				370
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(59)				(59)
Operating Lease, Liability	311				311
Property, Plant and Equipment, Other Types
Lessee, Lease, Description [Line Items]
Operating Lease, Cost	1	[1]	$ 1	[1]	3	[2]	$ 3	[2]
Lessee, Operating Lease, Liability, to be Paid	44				44
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(10)				(10)
Operating Lease, Liability	$ 34				$ 34

[1] Includes immaterial short-term lease expense.

[2] Includes immaterial short-term lease expense.