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Fair Value Measurements - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details)	Mar. 31, 2024
Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment in unconsolidated subsidiaries, measurement input	0.25
Weighted average, measurement input	0.00%
Other assets, measurement input	0.25
Other assets, weighted average, measurement input	0.00%
Contingent consideration measurement input	0.05
Contingent consideration, weighted average, measurement input	0.00%
Volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Weighted average, measurement input	38.00%
Contingent consideration measurement input	0.21
Contingent consideration, weighted average, measurement input	0.00%
Volatility | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment in unconsolidated subsidiaries, measurement input	0.35
Volatility | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment in unconsolidated subsidiaries, measurement input	0.65
Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Investment in unconsolidated subsidiaries, measurement input	0.25
Weighted average, measurement input	0.00%

X

- Definition

Contingent Consideration Measurement Input

+ References

No definition available.

+ Details

Name:	cbre_ContingentConsiderationMeasurementInput
Namespace Prefix:	cbre_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Contingent consideration, Weighted Average, Measurement Input

+ References

No definition available.

+ Details

Name:	cbre_ContingentConsiderationWeightedAverageMeasurementInput
Namespace Prefix:	cbre_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Equity Method Investment, Weighted Average, Measurement Input

+ References

No definition available.

+ Details

Name:	cbre_EquityMethodInvestmentWeightedAverageMeasurementInput
Namespace Prefix:	cbre_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Other Assets, Measurement Input

+ References

No definition available.

+ Details

Name:	cbre_OtherAssetsMeasurementInput
Namespace Prefix:	cbre_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Other Assets, Weighted Average, Measurement Input

+ References

No definition available.

+ Details

Name:	cbre_OtherAssetsWeightedAverageMeasurementInput
Namespace Prefix:	cbre_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Value of input used to measure investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_EquitySecuritiesFvNiMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

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

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputPriceVolatilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_MeasurementInputTypeAxis=cbre_MeasurementInputDiscountYieldMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: