Investments - Changes in Allowance for Credit Losses on Mortgage Loans on Real Estate (Details) - USD ($)	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	$ 99,000,000
Additions (reductions) from provision for credit loss expense	16,000,000	$ 3,000,000	$ (112,000,000)
Balance as of end-of-year	114,000,000	99,000,000
Mortgage loans on real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	99,000,000	96,000,000	204,000,000
Additions (reductions) from provision for credit loss expense	15,000,000	3,000,000	(108,000,000)
Additions from purchases of PCD mortgage loans on real estate	0	0	0
Balance as of end-of-year	114,000,000	99,000,000	96,000,000
Credit loss expense (reversal)	(1,000,000)	0	4,000,000
Accrued interest receivable excluded from credit losses	68,000,000	51,000,000	49,000,000
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	84,000,000
Balance as of end-of-year	86,000,000	84,000,000
Commercial \| Mortgage loans on real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	84,000,000	79,000,000	187,000,000
Additions (reductions) from provision for credit loss expense	2,000,000	5,000,000	(108,000,000)
Additions from purchases of PCD mortgage loans on real estate	0	0	0
Balance as of end-of-year	86,000,000	84,000,000	79,000,000
Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	15,000,000
Balance as of end-of-year	28,000,000	15,000,000
Residential \| Mortgage loans on real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance as of beginning-of-year	15,000,000	17,000,000	17,000,000
Additions (reductions) from provision for credit loss expense	13,000,000	(2,000,000)	0
Additions from purchases of PCD mortgage loans on real estate	0	0	0
Balance as of end-of-year	$ 28,000,000	$ 15,000,000	$ 17,000,000

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

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

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- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479344/326-20-45-1

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

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- Definition

Amount, excluding accrued interest, of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 19
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-19

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

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- Definition

Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

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