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Mortgage Loans on Real Estate - Mortgage Loan Portfolio Summary (Details) - Mortgage Receivable - USD ($) $ in Millions	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized cost	$ 12,096		$ 5,711
Allowance for credit losses	(54)	$ (54)	(53)	$ (43)	$ (49)	$ (38)
Mortgage loans, carrying value	12,042		5,658
Commercial Mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Principal outstanding	9,778		5,870
Deferred fees and costs, net	(73)		(72)
Unamortized discounts and premiums, net	(530)		(87)
Amortized cost	9,175		5,711
Allowance for credit losses	(54)	(54)	(53)	(43)	(49)	(38)
Mortgage loans, carrying value	9,121		5,658
Residential Mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Principal outstanding	3,145		57
Deferred fees and costs, net	(132)		(57)
Unamortized discounts and premiums, net	(92)		0
Amortized cost	2,921		0
Allowance for credit losses	0	$ 0	0	$ 0	$ 0	$ 0
Mortgage loans, carrying value	$ 2,921		$ 0