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Investments in Equity Securities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Debt and Equity Securities, FV-NI [Line Items]
Carrying amount of investments	$ 36	$ 36
Assets	2,878	2,800
Liabilities	1,894	1,869
Variable Interest Entity, Primary Beneficiary
Debt and Equity Securities, FV-NI [Line Items]
Assets	151	193
Liabilities	$ 85	$ 87
Company Limited | Variable Interest Entity, Primary Beneficiary
Debt and Equity Securities, FV-NI [Line Items]
Equity ownership percentage	70.00%

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481203/810-10-50-5A

+ Details

Name:	us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_ConsolidatedEntitiesAxis=us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis=uls_ULCCICCompanyLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: