v2.4.1.9

Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Change in uncertain tax positions	$ 1.1us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions	$ 1.8us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions	$ 28.5us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions
Cash paid for income taxes, net of refunds	105.4us-gaap_ProceedsFromIncomeTaxRefunds	99.5us-gaap_ProceedsFromIncomeTaxRefunds	38.4us-gaap_ProceedsFromIncomeTaxRefunds
Decrease in deferred tax liability	27.1us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability
Accrued interest and penalties	0.3us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	0.9us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Valuation Allowance, Operating Loss Carryforwards [Member]
Income Taxes [Line Items]
Decrease in valuation allowance	37.6us-gaap_ValuationAllowancesAndReservesAdjustments / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_ValuationAllowanceOperatingLossCarryforwardsMember
Fibra Prologis [Member]
Income Taxes [Line Items]
Decrease in deferred tax liability	$ 62.8us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAdjustmentOfDeferredTaxAssetLiability / us-gaap_BusinessAcquisitionAxis = pld_FibraPrologisMember

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Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

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The amount of cash received during the period as refunds for the overpayment of taxes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586



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Amount of increase (decrease) to previously recorded tax expense. Includes, but is not limited to, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, and IRS tax settlement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

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-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28446-109314



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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)

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Total of the adjustments in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

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-Section S99

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-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690



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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 09

-Article 12

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