v2.4.0.8

Financial Instruments and Fair Value Measurements - Derivative Activity (Detail) In Millions, unless otherwise specified |  | 9 Months Ended
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Sep. 30, 2013 USD ($) | Sep. 30, 2014 Euro Forward Contracts [Member] Foreign Currency Contracts [Member] USD ($) Derivative | Sep. 30, 2014 Euro Forward Contracts [Member] Foreign Currency Contracts [Member] EUR (€) | Sep. 30, 2013 Euro Forward Contracts [Member] Foreign Currency Contracts [Member] USD ($) | Sep. 30, 2013 Euro Forward Contracts [Member] Foreign Currency Contracts [Member] EUR (€) | Sep. 30, 2014 Yen Forward Contracts [Member] Foreign Currency Contracts [Member] USD ($) Derivative | Sep. 30, 2014 Yen Forward Contracts [Member] Foreign Currency Contracts [Member] JPY (¥) | Sep. 30, 2013 Yen Forward Contracts [Member] Foreign Currency Contracts [Member] USD ($) | Sep. 30, 2013 Yen Forward Contracts [Member] Foreign Currency Contracts [Member] JPY (¥) | Sep. 30, 2014 Interest Rate Swaps [Member] USD ($) Derivative | Sep. 30, 2013 Interest Rate Swaps [Member] USD ($) | Sep. 30, 2014 GBP Forward Contracts [Member] Foreign Currency Contracts [Member] USD ($) Derivative | Sep. 30, 2014 GBP Forward Contracts [Member] Foreign Currency Contracts [Member] GBP (£) | Sep. 30, 2014 Euro Options Contracts [Member] Foreign Currency Contracts [Member] USD ($) Derivative | Sep. 30, 2014 Euro Options Contracts [Member] Foreign Currency Contracts [Member] EUR (€)
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amounts at January 1, | $ 319.9 | $ 800.0 | € 600.0 | $ 1,304.0 | € 1,000.0 | $ 250.0 | ¥ 24,136.0 |  |  | $ 71.0 | $ 1,315.0 |  |  |  |
New contracts |  | 1,979 | 1,446 | 800 | 600 | 769 | 79,010 | 250 | 24,136 | 373 |  | 400 | 400 | 187 | 141
Matured or expired contracts |  | (1,979) | (1,446) | (1,304) | (1,000) | (769) | (79,010) |  |  |  | (1,230) |  |  | (90) | (66)
Notional amounts at September 30 | $ 319.9 | $ 800.0 | € 600.0 | $ 800.0 | € 600.0 | $ 250.0 | ¥ 24,136.0 | $ 250.0 | ¥ 24,136.0 | $ 444.0 | $ 85.0 | $ 400.0 | £ 238.0 | $ 97.0 | € 75.0
Active contracts at September 30, |  | 7,000,000 | 7,000,000 |  |  | 3,000,000 | 3,000,000 |  |  | 3,000,000 |  | 3,000,000 | 3,000,000 | 5,000,000 | 5,000,000
Weighted Average Forward Rate at September 30, |  | 1.33 | 1.33 |  |  | 96.54 | 96.54 |  |  |  |  | 1.68 | 1.68 | 1.30 | 1.30

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Matured or expired derivative contracts. + References No definition available. + Details
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Namespace Prefix: | pld_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition New contracts on derivative instruments during the period. + References No definition available. + Details
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Namespace Prefix: | pld_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Number of outstanding derivative contracts + References No definition available. + Details
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Namespace Prefix: | pld_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Average contractual rate at which a foreign currency can be purchased or sold. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

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