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Stock-based compensation - Narrative (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Pre-IPO Incentive Award Plan |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Shares authorized (in shares) | 1 |  | 1 |  |
Time-Based Restricted Stock Unit Awards |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense | $ 1 | $ 0 | $ 1 | $ 0 |
Unrecognized noncash compensation cost | 2 |  | $ 2 |  |
Unrecognized noncash compensation cost, weighted-average period to be recognized |  |  | 2 years |  |
Time-Based Restricted Stock Unit Awards | Minimum |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Award vesting period (in years) |  |  | 1 year |  |
Time-Based Restricted Stock Unit Awards | Maximum |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Award vesting period (in years) |  |  | 3 years |  |
BGLH Restricted Class B Units |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense | 3 | 3 | $ 6 | 6 |
Unrecognized noncash compensation cost | 5 |  | $ 5 |  |
Unrecognized noncash compensation cost, weighted-average period to be recognized |  |  | 1 year |  |
Management Profits Interests Class C Units |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense | 2 | $ 2 | $ 4 | $ 4 |
Unrecognized noncash compensation cost | 9 |  | $ 9 |  |
Management Profits Interests Class C Units | Minimum |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Award vesting period (in years) |  |  | 3 years |  |
Management Profits Interests Class C Units | Maximum |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Award vesting period (in years) |  |  | 5 years |  |
LLH Value Creation Unit Plan Units |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |
Award vesting period (in years) |  |  | 4 years |  |
Unrecognized noncash compensation cost | $ 34 |  | $ 34 |  | $ 37

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