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Investments in Equity Securities (Details)
$ in Millions
 12 Months Ended
Jun. 26, 2002
Dec. 31, 2024
USD ($)
director
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2023
USD ($)
Debt and Equity Securities, FV-NI [Line Items]          
Carrying amount of investments   $ 36     $ 42
Unrealized gain     $ 11 $ 11  
Initial duration 10 years        
Total number of directors | director   7      
Number of directors appointed by UL Solutions | director   4      
Number of directors appointed by CCIC | director   3      
Assets   $ 2,800     2,736
Liabilities   1,869     2,058
Non-controlling Interests          
Debt and Equity Securities, FV-NI [Line Items]          
Equity investments in non-consolidated affiliates   22     22
Non-controlling Interests | DQS Holding GmbH          
Debt and Equity Securities, FV-NI [Line Items]          
Equity investments in non-consolidated affiliates   $ 21     $ 21
Ownership percentage   28.00%     28.00%
Variable Interest Entity, Primary Beneficiary          
Debt and Equity Securities, FV-NI [Line Items]          
Assets   $ 193     $ 178
Liabilities   $ 87     $ 82
Variable Interest Entity, Primary Beneficiary | UL-CCIC Company Limited          
Debt and Equity Securities, FV-NI [Line Items]          
Equity ownership percentage   70.00%      
Variable Interest Entity, Not Primary Beneficiary | UL-CCIC Company Limited | China Certification & Inspection Group          
Debt and Equity Securities, FV-NI [Line Items]          
Equity ownership percentage   30.00%