Unconsolidated Entities - Summary of Remaining Equity Commitments (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)
Schedule Of Equity Method Investments [Line Items]
Remaining equity commitments	$ 3,118
Prologis Targeted U S Logistics Fund [Member]
Schedule Of Equity Method Investments [Line Items]
Remaining equity commitments	$ 348
Expiration date for remaining commitments range start	2019
Expiration date for remaining commitments range end	2020	[1]
Prologis European Logistics Fund [Member]
Schedule Of Equity Method Investments [Line Items]
Remaining equity commitments	$ 1,010	[1]
Expiration date for remaining commitments range start	2019	[1]
Prologis U.K. Logistics Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Remaining equity commitments	$ 119	[2]
Expiration date for remaining commitments range start	2021	[2]
Prologis China Logistics Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Remaining equity commitments	$ 1,641
Expiration date for remaining commitments range start	2020
Expiration date for remaining commitments range end	2024
Prologis Inc [Member]
Schedule Of Equity Method Investments [Line Items]
Remaining equity commitments	$ 264
Prologis Inc [Member] | Prologis Targeted U S Logistics Fund [Member]
Schedule Of Equity Method Investments [Line Items]
Remaining equity commitments	0
Prologis Inc [Member] | Prologis European Logistics Fund [Member]
Schedule Of Equity Method Investments [Line Items]
Remaining equity commitments	0	[1]
Prologis Inc [Member] | Prologis U.K. Logistics Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Remaining equity commitments	18	[2]
Prologis Inc [Member] | Prologis China Logistics Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Remaining equity commitments	246
Venture Partners [Member]
Schedule Of Equity Method Investments [Line Items]
Remaining equity commitments	2,854
Venture Partners [Member] | Prologis Targeted U S Logistics Fund [Member]
Schedule Of Equity Method Investments [Line Items]
Remaining equity commitments	348
Venture Partners [Member] | Prologis European Logistics Fund [Member]
Schedule Of Equity Method Investments [Line Items]
Remaining equity commitments	1,010	[1]
Venture Partners [Member] | Prologis U.K. Logistics Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Remaining equity commitments	101	[2]
Venture Partners [Member] | Prologis China Logistics Venture [Member]
Schedule Of Equity Method Investments [Line Items]
Remaining equity commitments	$ 1,395

[1] Equity commitments are denominated in euro and reported in U.S. dollars based on an exchange rate of $1.16 U.S. dollars to the euro.

[2] Equity commitments are denominated in British pounds sterling and reported in U.S. dollars based on an exchange rate of $1.30 U.S. dollars to the British pound sterling