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Warehouse Receivables & Warehouse Lines of Credit - Narrative (Details) - Warehouse Agreement Borrowings $ in Billions	9 Months Ended
	Sep. 30, 2022 USD ($)
Short-term Debt [Line Items]
Period of repayment for warehouse lines of credit	1 month
Maximum lines of credit principal outstanding	$ 1.6

X

- Definition

Period of repayment for warehouse lines of credit.

+ References

No definition available.

+ Details

Name:	cbre_PeriodOfRepaymentForWarehouseLinesOfCredit
Namespace Prefix:	cbre_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ShortTermDebtLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, the maximum amount borrowed at any time during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_ShorttermDebtMaximumAmountOutstandingDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=us-gaap_WarehouseAgreementBorrowingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: