Mortgage Loans on Real Estate - Narrative (Details)	3 Months Ended	6 Months Ended
Jun. 30, 2024 USD ($) loan_modification segment property loan	Jun. 30, 2023 USD ($) loan_modification	Jun. 30, 2024 USD ($) segment property loan_modification loan	Jun. 30, 2023 USD ($) 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
Financing receivable, accrued interest, after allowance for credit loss	$ 94,000,000		$ 94,000,000		$ 27,000,000
Real estate acquired through foreclosure, number of units \| property	13		13		3
Real estate acquired through foreclosure	$ 68,000,000		$ 68,000,000		$ 79,000,000
Number of significant mortgage loan modifications \| loan_modification	3	3	7	5
Mortgage Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, excluding accrued interest, after allowance for credit loss	$ 12,042,000,000		$ 12,042,000,000		$ 5,658,000,000
Financing receivable, accrued interest, writeoff	$ 1,000,000	$ 0	$ 1,000,000	$ 0
Financing receivable, threshold period, nonperforming			90 days
Financing receivable, nonaccrual, number of loans \| loan	206		206		3
Interest income recognized on loans in non-accrual status	$ 1,000,000	$ 0	$ 1,000,000	$ 0
Residential Mortgage \| Mortgage Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, excluding accrued interest, after allowance for credit loss	$ 2,921,000,000		$ 2,921,000,000		$ 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.

+ References

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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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- Definition

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

+ References

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-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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- Definition

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

+ References

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.

+ References

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

Amount of interest income on financing receivable on nonaccrual status.

+ References

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