Inventories - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Inventories [Abstract]
Cost of goods sold to write-down certain inventories	$ 13	$ 6	$ 74	$ 23
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