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Long-Term Debt - Narrative (Details) - USD ($) $ in Millions		1 Months Ended		12 Months Ended
	Jun. 28, 2024	Dec. 31, 2023	Jan. 31, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Oct. 31, 2023
Debt Instrument [Line Items]
Accordion feature, increase in limit			$ 625
Dividends to stockholders of UL Solutions				$ 100	$ 680	$ 1,600
Related Party
Debt Instrument [Line Items]
Dividends to stockholders of UL Solutions		$ 600		$ 83	$ 680	$ 1,600
Term loans
Debt Instrument [Line Items]
Accordion feature, increase in limit			400
Credit Facility \| Term Loans and Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			1,250
Credit Facility \| Term loans
Debt Instrument [Line Items]
Interest rate		6.46%		5.58%	6.46%
Credit Facility \| Revolving credit facility
Debt Instrument [Line Items]
Credit facility, outstanding amount		$ 7		$ 6	$ 7
SOFR adjustment	0.10%
Maximum leverage ratio				350.00%
Maximum maintenance level				4.0
Maximum aggregate consideration				$ 100
Maximum net leverage ratio, netting				$ 250
Credit Facility \| Revolving credit facility \| Variable Rate Component One
Debt Instrument [Line Items]
Fixed interest rate				1.125%
Credit Facility \| Revolving credit facility \| Variable Rate Component One \| Minimum
Debt Instrument [Line Items]
SOFR adjustment				1.00%
Credit Facility \| Revolving credit facility \| Variable Rate Component One \| Maximum
Debt Instrument [Line Items]
SOFR adjustment				1.50%
Credit Facility \| Revolving credit facility \| Variable Rate Component Two
Debt Instrument [Line Items]
Fixed interest rate				0.125%
Credit Facility \| Revolving credit facility \| Variable Rate Component Two \| Minimum
Debt Instrument [Line Items]
SOFR adjustment				0.00%
Credit Facility \| Revolving credit facility \| Variable Rate Component Two \| Maximum
Debt Instrument [Line Items]
SOFR adjustment				0.50%
Credit Facility \| Revolving credit facility \| Variable Rate Component Three \| Minimum
Debt Instrument [Line Items]
SOFR adjustment				0.10%
Credit Facility \| Revolving credit facility \| Variable Rate Component Three \| Maximum
Debt Instrument [Line Items]
SOFR adjustment				0.20%
Credit Facility \| Revolving credit facility \| Revolving credit facility
Debt Instrument [Line Items]
Interest rate		6.45%			6.45%
Maximum borrowing capacity			750
Proceeds from credit facility			200
Repayments				$ 110	$ 110
Credit Facility \| Revolving credit facility \| Term loans
Debt Instrument [Line Items]
Maximum borrowing capacity			500
Proceeds from credit facility			500
Repayments				$ 56
Credit Facility \| Revolving credit facility \| Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 25
Senior Notes Due 2028 \| Senior notes
Debt Instrument [Line Items]
Fixed interest rate							6.50%
Face amount							$ 300
Percentage of principal amount				101.00%