Mortgage Loans on Real Estate - Narrative (Details) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2025 USD ($) segment loan	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) segment loan	Sep. 30, 2024 USD ($)	Dec. 31, 2024 loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, number of portfolio segments \| segment	2		2
Financing receivable, modified in period, amount			$ 84	$ 143
Mortgage loans on real estate, net of allowance
Financing Receivable, Allowance for Credit Loss [Line Items]
Interest income recognized on loans in non-accrual status	$ 3	$ 1	4	2
Financing receivable, accrued interest, writeoff	$ 0	$ 0	$ 5	$ 1
Financing receivable, mortgage loans, loan to value ratio	75.00%		75.00%
Financing receivable, threshold period, uncollectible			90 days
Financing receivable, nonaccrual, number of loans \| loan	275		275		263

Financing Receivable, Mortgage Loans, Loan To Value Ratio

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Number of loans in nonaccrual status.

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The number of portfolio segments which make up financing receivables.

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Financing Receivable, Threshold Period, Uncollectible

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Amount of writeoff of accrued interest on financing receivable recognized by reversing interest income.

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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.

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Amortized cost of financing receivable modified during period for debtor experiencing financial difficulty.

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Amount of interest income on financing receivable on nonaccrual status.

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