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Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Related Party Transaction [Line Items]
Dividends to stockholders of UL Solutions	$ 27	$ 25	$ 79	$ 75
UL Standards & Engagement Transactions
Related Party Transaction [Line Items]
Incurred expenses	5	6	16	16
Related Party
Related Party Transaction [Line Items]
Dividends to stockholders of UL Solutions	$ 18	$ 20	$ 54	$ 65

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