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Trade and other receivables - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2021
Text Block [Abstract]
Trade receivables settlement period	30 days
Loans and advances settlement period	12 months
Payment​ cycle​ receivables​ settlement period	4 days

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- Definition

Loans and advances settlement period.

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No definition available.

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Name:	grab_LoansAndAdvancesSettlementPeriod
Namespace Prefix:	grab_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- Definition

Payment cycle receivables settlement period.

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No definition available.

+ Details

Name:	grab_PaymentCycleReceivablesSettlementPeriod
Namespace Prefix:	grab_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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- Definition

Text block abstract.

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No definition available.

+ Details

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

X

- Definition

Trade receivables settlement period.

+ References

No definition available.

+ Details

Name:	grab_TradeReceivablesSettlementPeriod
Namespace Prefix:	grab_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration