Mortgage Loans on Real Estate - Narrative (Details)	3 Months Ended	9 Months Ended
Sep. 30, 2024 USD ($) loan_modification loan property segment	Sep. 30, 2023 USD ($) loan_modification	Sep. 30, 2024 USD ($) loan loan_modification property segment	Sep. 30, 2023 USD ($) loan_modification	Dec. 31, 2023 USD ($) property loan
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, number of portfolio segments \| segment	2		2
Total, net of allowance	$ 90,000,000		$ 90,000,000		$ 27,000,000
Real estate acquired through foreclosure, number of units \| property	33		33		3
Real estate acquired through foreclosure	$ 114,000,000		$ 114,000,000		$ 79,000,000
Number of significant mortgage loan modifications \| loan_modification	3	6	10	11
Mortgage loans on real estate, at amortized cost
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	$ 11,866,000,000		$ 11,866,000,000		$ 5,658,000,000
Financing receivable, accrued interest, writeoff	$ 0	$ 0	$ 1,000,000	$ 0
Financing receivable, threshold period, nonperforming			90 days
Financing receivable, nonaccrual, number of loans \| loan	227		227		3
Interest income recognized on loans in non-accrual status	$ 1,000,000	$ 0	$ 2,000,000	$ 0
Residential Mortgage \| Mortgage loans on real estate, at amortized cost
Financing Receivable, Allowance for Credit Loss [Line Items]
Total	$ 2,777,000,000		$ 2,777,000,000		$ 0

Number of loans in nonaccrual status.

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The number of portfolio segments which make up financing receivables.

+ References

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Threshold period for when financing receivable is considered nonperforming.

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- Definition

Number Of Significant Mortgage Loan Modifications

+ References

No definition available.

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- Definition

Real Estate Acquired Through Foreclosure, Number of Units

+ References

No definition available.

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Amount, after allowance for credit loss, of accrued interest on financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 5
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-URI https://asc.fasb.org/1943274/2147479344/326-20-45-5

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

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3D
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3D

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
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Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
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- Definition

Amount of interest income on financing receivable on nonaccrual status.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
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- Definition

Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
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