Real Estate and Other Activities - Other Investment Activities - Additional Information (Detail) SFr in Millions, $ in Millions			3 Months Ended
	Nov. 03, 2023 USD ($)	Aug. 17, 2023 USD ($)	Jun. 30, 2023 CHF (SFr)	Sep. 30, 2023 USD ($)
Steward Health Care System L L C [Member]
Business Acquisition [Line Items]
Other investment on secured loan with credit facility collateral				$ 40
Repayment received on credit facility availed	$ 2
Repayments of mortgage loan | SFr			SFr 60
Steward Health Care System L L C [Member] | Asset-Backed Securities [Member]
Business Acquisition [Line Items]
Investments				$ 105
Sale of investment		$ 105
Global Asset Manager [Member]
Business Acquisition [Line Items]
Sale of investment		$ 100