Commitments and Contingencies (Details) $ in Millions	1 Months Ended			3 Months Ended	9 Months Ended
Commitments and Contingencies (Details) $ in Millions	Jul. 31, 2026 jointVenture	Jun. 30, 2026 jointVenture	Mar. 31, 2026 jointVenture	Sep. 30, 2026 USD ($) jointVenture	Sep. 30, 2026 USD ($) numberOfBatteryStorageFacilities	Dec. 31, 2027 USD ($)	Dec. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)
Other Commitments [Line Items]
Number Of Battery Storage Facilities, To-Be-Built \| numberOfBatteryStorageFacilities					4
Number Of Joint Ventures \| jointVenture	2	2	4	2
Investments in equity method investees				$ 661	$ 661			$ 625
Mammoth Plains Energy Storage Company, LLC, And Carousel Energy Storage Project Company, LLC
Other Commitments [Line Items]
Investments in equity method investees				$ 13	$ 13
Forecast
Other Commitments [Line Items]
Remaining commitments						$ 286	$ 16

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.