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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% |  |  |

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