Inventories - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Inventories [Abstract]
Cost of goods sold to write-down certain inventories	$ 61	$ 16
Reversal of inventory write-down	$ 0

Inventory Reserve, Current, Additions During Period

No definition available.

Name:	gfs_InventoryReserveCurrentAdditionsDuringPeriod
Namespace Prefix:	gfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration