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Subsequent events - Stock-based Compensation - Narrative (Details) - USD ($) $ in Millions		1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 26, 2024	Jul. 25, 2024	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
BGLH Restricted Class B Units
Subsequent Event [Line Items]
Awards granted in 2024 (in shares)					31,088
Stock-based compensation expense			$ 3	$ 3	$ 6	$ 6
Subsequent Event | IPO Stock Payment Awards
Subsequent Event [Line Items]
Awards granted in 2024 (in shares)	215,149
Subsequent Event | LVCP Units
Subsequent Event [Line Items]
Awards granted in 2024 (in shares)	179,838
Subsequent Event | Long-Term Incentive Plan Units
Subsequent Event [Line Items]
Awards granted in 2024 (in shares)	498,691
Subsequent Event | BGLH Restricted Class B Units
Subsequent Event [Line Items]
Share-based payment arrangement, accelerated cost	$ 5
Subsequent Event | LLH Value Creation Unit Plan Units
Subsequent Event [Line Items]
Stock-based compensation expense	$ 26	$ 0
Pre-IPO Incentive Award Plan
Subsequent Event [Line Items]
Shares authorized (in shares)			1,000,000		1,000,000
Pre-IPO Incentive Award Plan | Subsequent Event
Subsequent Event [Line Items]
Shares authorized (in shares)	12,500,000
LHH Value Creation Plan | Subsequent Event | Restricted Stock Units (RSUs)
Subsequent Event [Line Items]
Awards granted in 2024 (in shares)	654,690
Equity Award Program | Subsequent Event | Restricted Stock Units (RSUs)
Subsequent Event [Line Items]
Awards granted in 2024 (in shares)	291,511
Management Profit Interest Class C Unit Replacement Plan | Subsequent Event | Restricted Stock Units And LTIP Units
Subsequent Event [Line Items]
Awards granted in 2024 (in shares)	1,066,763

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

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-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-Publisher FASB
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-Paragraph 2
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-Publisher FASB
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No definition available.

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+ References

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
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