Real Estate and Other Activities - Investments in Unconsolidated Operating Entities - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Business Acquisition [Line Items]
Unfavorable fair market value adjustment on investment	$ 30	$ 430
Other [Member] \| COVID-19 Pandemic [Member]
Business Acquisition [Line Items]
Favorable non-cash fair value adjustment on investment	$ 30	$ 216

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-5

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration