v3.8.0.1
Unconsolidated Entities - Summary of Operating Information and Financial Position of Unconsolidated Co-investment Ventures (Detail) - Unconsolidated Co-Investment Ventures [Member]
ft² in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
ft²
Property
Venture
Dec. 31, 2016
USD ($)
ft²
Property
Venture
Dec. 31, 2015
USD ($)
ft²
Property
Venture
Schedule Of Equity Method Investments [Line Items]      
Number of ventures | Venture 8 9 9
Number of buildings | Property 1,559 1,367 1,350
Square feet | ft² 332 291 277
Total assets $ 28,899 $ 23,057 $ 22,553
Third-party debt 8,079 6,546 6,250
Total liabilities 9,642 7,876 7,593
Our investment balance [1] 5,275 4,058 4,585
Revenues 2,180 1,943 1,832
Net earnings $ 798 $ 562 $ 451
Weighted Average [Member]      
Schedule Of Equity Method Investments [Line Items]      
Ownership Percentage [2] 28.80% 27.90% 31.60%
U.S. [Member]      
Schedule Of Equity Method Investments [Line Items]      
Number of ventures | Venture 1 1 1
Number of buildings | Property 552 369 391
Square feet | ft² 88 50 50
Total assets $ 7,062 $ 4,238 $ 4,408
Third-party debt 2,313 1,414 1,433
Total liabilities 2,520 1,540 1,550
Our investment balance [1] 1,383 435 690
Revenues 533 395 382
Net earnings $ 139 $ 57 $ 35
U.S. [Member] | Weighted Average [Member]      
Schedule Of Equity Method Investments [Line Items]      
Ownership Percentage [2] 28.20% 14.90% 22.50%
Other Americas [Member]      
Schedule Of Equity Method Investments [Line Items]      
Number of ventures | Venture 2 2 2
Number of buildings | Property 205 213 205
Square feet | ft² 37 42 39
Total assets $ 2,118 $ 2,793 $ 2,482
Third-party debt 756 739 657
Total liabilities 782 814 708
Our investment balance [1] 555 845 786
Revenues 245 242 228
Net earnings $ 71 $ 71 $ 78
Other Americas [Member] | Weighted Average [Member]      
Schedule Of Equity Method Investments [Line Items]      
Ownership Percentage [2] 43.40% 43.90% 43.80%
Europe [Member]      
Schedule Of Equity Method Investments [Line Items]      
Number of ventures | Venture 3 4 4
Number of buildings | Property 707 700 688
Square feet | ft² 166 163 159
Total assets $ 13,586 $ 10,853 $ 11,343
Third-party debt 2,682 2,446 2,640
Total liabilities 3,655 3,283 3,584
Our investment balance [1] 2,813 2,327 2,707
Revenues 1,030 964 947
Net earnings $ 406 $ 333 $ 261
Europe [Member] | Weighted Average [Member]      
Schedule Of Equity Method Investments [Line Items]      
Ownership Percentage [2] 32.80% 35.10% 38.90%
Asia [Member]      
Schedule Of Equity Method Investments [Line Items]      
Number of ventures | Venture 2 2 2
Number of buildings | Property 95 85 66
Square feet | ft² 41 36 29
Total assets $ 6,133 $ 5,173 $ 4,320
Third-party debt 2,328 1,947 1,520
Total liabilities 2,685 2,239 1,751
Our investment balance [1] 524 451 402
Revenues 372 342 275
Net earnings $ 182 $ 101 $ 77
Asia [Member] | Weighted Average [Member]      
Schedule Of Equity Method Investments [Line Items]      
Ownership Percentage [2] 15.10% 15.10% 15.00%
[1] The difference between our ownership interest of a venture’s equity and our investment balance at December 31, 2017, 2016 and 2015, results principally from three types of transactions: (i) deferring a portion of the gains we recognize from a contribution of a property to a venture ($667.3 million, $469.9 million and $430.7 million, respectively); (ii) recording additional costs associated with our investment in the venture ($94.2 million, $124.1 million and $122.1 million, respectively); and (iii) advances to a venture ($210.0 million, $166.1 million and $189.7 million, respectively).
[2] Represents our weighted average ownership interest in all co-investment ventures based on each entity’s contribution of total assets, before depreciation, net of other liabilities