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Schedule III - Real Estate and Accumulated Depreciation-Overall Summary (Details) | Dec. 31, 2019 USD ($) Property ApartmentUnit | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
--- | --- | --- | --- | ---
Overall summary of real estate and accumulated depreciation |  |  |  |
Investment in Real Estate, Gross | $ 27,533,607,000 | $ 26,511,022,000 | $ 26,026,896,000 | $ 25,386,425,000
Accumulated Depreciation | $ (7,276,786,000) | $ (6,696,281,000) | $ (6,040,378,000) | $ (5,360,389,000)
Investment in Real Estate - Wholly Owned Unencumbered [Member] |  |  |  |
Overall summary of real estate and accumulated depreciation |  |  |  |
Properties | Property | 257 |  |  |
Units | ApartmentUnit | 68,002 |  |  |
Investment in Real Estate, Gross | $ 23,408,268,350 |  |  |
Accumulated Depreciation | (6,199,955,243) |  |  |
Investment in Real Estate, Net | 17,208,313,107 |  |  |
Encumbrances | $ 0 |  |  |
Investment in Real Estate - Wholly Owned Encumbered [Member] |  |  |  |
Overall summary of real estate and accumulated depreciation |  |  |  |
Properties | Property | 35 |  |  |
Units | ApartmentUnit | 8,425 |  |  |
Investment in Real Estate, Gross | $ 3,204,805,398 |  |  |
Accumulated Depreciation | (792,348,079) |  |  |
Investment in Real Estate, Net | 2,412,457,319 |  |  |
Encumbrances | $ 1,630,731,451 |  |  |
Wholly Owned Properties |  |  |  |
Overall summary of real estate and accumulated depreciation |  |  |  |
Properties | Property | 292 |  |  |
Units | ApartmentUnit | 76,427 |  |  |
Investment in Real Estate, Gross | $ 26,613,073,748 |  |  |
Accumulated Depreciation | (6,992,303,322) |  |  |
Investment in Real Estate, Net | 19,620,770,426 |  |  |
Encumbrances | $ 1,630,731,451 |  |  |
Investment in Real Estate - Partially Owned Unencumbered [Member] |  |  |  |
Overall summary of real estate and accumulated depreciation |  |  |  |
Properties | Property | 9 |  |  |
Units | ApartmentUnit | 1,847 |  |  |
Investment in Real Estate, Gross | $ 524,897,809 |  |  |
Accumulated Depreciation | (133,111,488) |  |  |
Investment in Real Estate, Net | 391,786,321 |  |  |
Encumbrances | $ 0 |  |  |
Investment in Real Estate - Partially Owned Encumbered [Member] |  |  |  |
Overall summary of real estate and accumulated depreciation |  |  |  |
Properties | Property | 8 |  |  |
Units | ApartmentUnit | 1,688 |  |  |
Investment in Real Estate, Gross | $ 395,635,869 |  |  |
Accumulated Depreciation | (151,371,564) |  |  |
Investment in Real Estate, Net | 244,264,305 |  |  |
Encumbrances | $ 310,878,101 |  |  |
NONCONTROLLING INTERESTS - PARTIALLY OWNED PROPERTIES |  |  |  |
Overall summary of real estate and accumulated depreciation |  |  |  |
Properties | Property | 17 |  |  |
Units | ApartmentUnit | 3,535 |  |  |
Investment in Real Estate, Gross | $ 920,533,678 |  |  |
Accumulated Depreciation | (284,483,052) |  |  |
Investment in Real Estate, Net | 636,050,626 |  |  |
Encumbrances | $ 310,878,101 |  |  |
Unencumbered Properties [Member] |  |  |  |
Overall summary of real estate and accumulated depreciation |  |  |  |
Properties | Property | 266 |  |  |
Units | ApartmentUnit | 69,849 |  |  |
Investment in Real Estate, Gross | $ 23,933,166,159 |  |  |
Accumulated Depreciation | (6,333,066,731) |  |  |
Investment in Real Estate, Net | 17,600,099,428 |  |  |
Encumbrances | $ 0 |  |  |
Encumbered Properties [Member] |  |  |  |
Overall summary of real estate and accumulated depreciation |  |  |  |
Properties | Property | 43 |  |  |
Units | ApartmentUnit | 10,113 |  |  |
Investment in Real Estate, Gross | $ 3,600,441,267 |  |  |
Accumulated Depreciation | (943,719,643) |  |  |
Investment in Real Estate, Net | 2,656,721,624 |  |  |
Encumbrances | $ 1,941,609,552 |  |  |
Total Consolidated Investment in Real Estate [Member] |  |  |  |
Overall summary of real estate and accumulated depreciation |  |  |  |
Properties | Property | 309 |  |  |
Units | ApartmentUnit | 79,962 |  |  |
Investment in Real Estate, Gross | $ 27,533,607,426 |  |  |
Accumulated Depreciation | (7,276,786,374) |  |  |
Investment in Real Estate, Net | 20,256,821,052 |  |  |
Encumbrances | $ 1,941,609,552 |  |  |

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