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 |