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Fair Value Measurements - Recurring Basis (Details) - USD ($) shares in Millions, $ in Millions		1 Months Ended
		Nov. 30, 2025	Dec. 31, 2025		Dec. 31, 2024
Fair value of assets and liabilities measured on recurring basis
Investment in NuScale(1)	[1]		$ 1,579		$ 0
Trading securities			2		18
NuScale
Fair value of assets and liabilities measured on recurring basis
Related party transaction, shares converted (in shares)		71
Carrying Value
Fair value of assets and liabilities measured on recurring basis
Investment in NuScale(1)			1,579		2,266
NuScale forward contract
Fair value of assets and liabilities measured on recurring basis
Asset Derivatives			208		0
Level 1
Fair value of assets and liabilities measured on recurring basis
Trading securities			2		18
Level 1 | Carrying Value
Fair value of assets and liabilities measured on recurring basis
Investment in NuScale(1)			1,579	[1]	2,266
Level 1 | NuScale forward contract
Fair value of assets and liabilities measured on recurring basis
Asset Derivatives			0		$ 0
Level 2 | NuScale forward contract
Fair value of assets and liabilities measured on recurring basis
Asset Derivatives			208
Level 3 | NuScale forward contract
Fair value of assets and liabilities measured on recurring basis
Asset Derivatives			$ 0
[1] (1) Our investment in NuScale was included in Investments as of December 31, 2024.

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