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Operating leases - Supplemental operating leases information (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 29, 2025 | Mar. 30, 2024
Lessee, Lease, Description [Line Items] |  |
Operating cash flows from operating leases | $ 7 | $ 2
Right-of-use assets obtained in exchange for operating lease liabilities | 18 | 36
New leases |  |
Lessee, Lease, Description [Line Items] |  |
Right-of-use assets obtained in exchange for operating lease liabilities | 18 | 36
Modified leases |  |
Lessee, Lease, Description [Line Items] |  |
Right-of-use assets obtained in exchange for operating lease liabilities | $ 0 | $ 0

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