Real Estate and Other Activities - Disposals - 2025 Activity - Additional Information (Detail) $ in Millions	1 Months Ended	3 Months Ended	9 Months Ended
Jun. 30, 2026 Facility	Mar. 31, 2025 USD ($)	Sep. 30, 2026 USD ($) Facility	Sep. 30, 2025 USD ($) Facility
Business Combination [Abstract]
Number of facilities sold \| Facility	3		5	5
Proceeds from sale of investments		$ 12	$ 31	$ 100
Gain (loss) on real estate dispositions			$ (1)	$ 4

Cash received for the sale of real estate that is not part of an investing activity during the current period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 12
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-12

Name:	us-gaap_ProceedsFromSaleOfRealEstate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration