Investments - Debt Maturities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fixed maturities
Available-for-sale Securities Including Securities Pledged [Line Items]
One year or less, Amortized cost	$ 611
After one year through five years, Amortized Cost	3,069
After five years through ten years, Amortized Cost	2,998
After ten years, Amortized Cost	9,025
Debt Securities, Available-for-Sale, Amortized Cost, Total	22,679	$ 24,367
One year or less, Fair value	602
After one year through five years, Fair Value	2,961
After five years through ten years, Fair Value	2,876
After ten years, Fair Value	7,982
Fixed maturities including securities pledged, Fair Value	20,839	21,819
Mortgage-backed securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	5,412
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	4,890
Other asset-backed securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	1,564
Debt Securities, Available-for-Sale, Amortized Cost, Total	1,564	1,418
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	1,528
Fixed maturities including securities pledged, Fair Value	$ 1,528	$ 1,310

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 50
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-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-3

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481830/320-10-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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