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Fair Value Measurements - Recurring Basis (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2025	Dec. 31, 2024
NuScale
Fair value of assets and liabilities measured on recurring basis
Related party transaction, shares converted (in shares)	15
Related party transaction, shares sold (in shares)	10
Related party transaction, proceeds from sale of shares	$ 414
Fair Value, Measurements, Recurring
Fair value of assets and liabilities measured on recurring basis
Investment in NuScale	4,186	$ 4,186	$ 2,266
Trading securities	8	8	18
Gain (loss) on investment in NuScale	401	2,300
Fair Value, Measurements, Recurring | Level 1
Fair value of assets and liabilities measured on recurring basis
Investment in NuScale	4,186	4,186	2,266
Trading securities	$ 8	$ 8	$ 18

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