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Mortgage Loans on Real Estate - Narrative (Details)	12 Months Ended
	Dec. 31, 2024 USD ($) segment loan	Dec. 31, 2023 USD ($) loan	Dec. 31, 2022 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, number of portfolio segments | segment	2
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]	Accrued investment income
Total, net of allowance	$ 99,000,000	$ 27,000,000
Financing receivable, modified in period, amount	260,000,000	219,000,000
Mortgage loans on real estate, net of allowance
Financing Receivable, Allowance for Credit Loss [Line Items]
Commercial mortgage loans, carrying value	12,117,000,000	5,658,000,000
Financing receivable, accrued interest, writeoff	$ 3,000,000	$ 0
Financing receivable, threshold period, nonperforming	90 days
Financing receivable, nonaccrual, number of loans | loan	263	3
Interest income recognized on loans in non-accrual status	$ 2,000,000	$ 2,000,000	$ 0
Mortgage loans on real estate, net of allowance | Residential Mortgage
Financing Receivable, Allowance for Credit Loss [Line Items]
Commercial mortgage loans, carrying value	$ 2,687,000,000	$ 0

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

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