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Warehouse Receivables & Warehouse Lines of Credit - Narrative (Details) | 12 Months Ended
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Dec. 31, 2022 USD ($)
Warehouse Agreement Borrowings |
Warehouse Receivables And Warehouse Lines Of Credit [Line Items] |
Lines of credit principal outstanding | $ 1,700,000,000

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- Definition Warehouse receivables and warehouse lines of credit. + References No definition available. + Details
Name: | cbre_WarehouseReceivablesAndWarehouseLinesOfCreditLineItems
Namespace Prefix: | cbre_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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

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