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Leases - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Rental income	$ 103	$ 95

X

- Definition

Leases.

+ References

No definition available.

+ Details

Name:	grab_LeasesAbstract
Namespace Prefix:	grab_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Rental​ income​ on lease of motor​ vehicles.

+ References

No definition available.

+ Details

Name:	grab_RentalIncomeOnLeaseOfMotorVehicles
Namespace Prefix:	grab_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration