XML 137 R102.htm IDEA: XBRL DOCUMENT v3.22.1

Share-Based Payment Arrangements - Summary of Reconciliation of Outstanding Share Options (Parenthetical) (Detail) - GHL [Member] - GHI Share [Member]	12 Months Ended
	Dec. 31, 2021
Statement [Line Items]
Conversion Ratio Common Stock	1.3032888
Sharebased Payment Arrangement, Option [Member]
Statement [Line Items]
Conversion Ratio Common Stock	1.3032888
Restricted Stock Units (RSUs) [Member]
Statement [Line Items]
Conversion Ratio Common Stock	1.3032888

X

- Definition

Conversion ratio, Common stock.

+ References

No definition available.

+ Details

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

X

- Definition

Statement.

+ References

No definition available.

+ Details

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

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=grab_GhlMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfShareCapitalAxis=grab_GhiShareMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=grab_SharebasedPaymentArrangementOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=grab_RestrictedStockUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: