Investments - Debt Maturities (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Available-for-sale Securities Including Securities Pledged [Line Items]
Debt Securities, Available-for-Sale, Amortized Cost, Total	$ 22,083	$ 19,743
Fixed maturities
Available-for-sale Securities Including Securities Pledged [Line Items]
One year or less, Amortized cost	708
After one year through five years, Amortized Cost	2,983
After five years through ten years, Amortized Cost	2,902
After ten years, Amortized Cost	10,201
Debt Securities, Available-for-Sale, Amortized Cost, Total	24,173	22,163
One year or less, Fair value	709
After one year through five years, Fair Value	2,983
After five years through ten years, Fair Value	2,871
After ten years, Fair Value	9,184
Fixed maturities including securities pledged, Fair Value	22,838	20,134
Mortgage-backed securities
Available-for-sale Securities Including Securities Pledged [Line Items]
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	5,402
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	5,116
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	1,977
Debt Securities, Available-for-Sale, Amortized Cost, Total	1,977	1,741
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	1,975
Fixed maturities including securities pledged, Fair Value	$ 1,975	$ 1,739

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in next rolling fiscal year following latest fiscal year. For interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
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-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
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-Section 50
-Paragraph 3
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-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

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-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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