Real Estate and Other Activities - Prospect - Additional Information (Detail) $ in Millions		1 Months Ended	3 Months Ended		9 Months Ended	12 Months Ended
	May 23, 2023 USD ($)	Aug. 31, 2019 USD ($) Hospital	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)	Sep. 30, 2026 USD ($)	Dec. 31, 2025 USD ($)
Prospect [Member]
Business Combination [Line Items]
Number of facilities acquired | Hospital		14
Purchase price of acquisition		$ 1,600
Pay down of debt instruments	$ 375
Reconstitution of asset	1,700
Asset sales and collection of Connecticut accounts receivable					$ 62
Mortgage Loans [Member] | Prospect [Member]
Business Combination [Line Items]
First lien secured loan	150
Maximum [Member] | Prospect [Member]
Business Combination [Line Items]
First lien secured loan	$ 75
Prospect [Member]
Business Combination [Line Items]
Funded investment					64
Recover of investments in Prospect					$ 64
Prospect [Member] | PHP Holdings [Member]
Business Combination [Line Items]
Loan impairment charges				$ 400
Asset impairment charges			$ 65			$ 140
Prospect [Member] | Minimum [Member] | Income Valuation Approach [Member] | Level 3 [Member]
Business Combination [Line Items]
Market capitalization rate					8.25%
Prospect [Member] | Maximum [Member] | Income Valuation Approach [Member] | Level 3 [Member]
Business Combination [Line Items]
Market capitalization rate					8.50%