For an unclassified balance sheet, amounts due from an entity in which the reporting entity shares joint control with another party or group.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39599-107864

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.3)
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

Name:	us-gaap_DueFromJointVentures
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Real Estate and Other Activities - Loans - Additional Information (Detail) € in Millions, £ in Millions, $ in Millions		9 Months Ended
	Jan. 19, 2021 GBP (£)	Sep. 30, 2021 USD ($)	Jan. 08, 2021 USD ($)	Dec. 31, 2018 EUR (€)
Primotop Holdings S.a.r.l. [Member]
Loans [Line Items]
Shareholder loan to joint venture \| €				€ 297
Waterland Private Equity Fund VII C.V. [Member]
Loans [Line Items]
Purchase price of acquisition loan \| £	£ 250
Steward Health Care System LLC [Member]
Loans [Line Items]
Other loan			$ 335
Repayments of other loan		$ 75