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Other Insurance Liabilities and Separate Accounts - Undiscounted Expected Gross Premiums and Expected Future Benefit Payments (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Large Case Pensions
Liability for Future Policy Benefit, Activity [Line Items]
Expected future benefit payments	$ 3,266	$ 3,539
Expected gross premiums	0	0
Long-Term Care
Liability for Future Policy Benefit, Activity [Line Items]
Expected future benefit payments	3,224	3,265
Expected gross premiums	$ 414	$ 437

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- Definition

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-Topic 944
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Amount, before effect of reinsurance, of undiscounted balance for expected future gross premium component of liability for future policy benefit.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 40
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-Section 55
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-URI https://asc.fasb.org//1943274/2147480046/944-40-55-29E

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Amount, before effect of reinsurance, of undiscounted balance for expected future policy benefit and expense component of liability for future policy benefit.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 40
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-Section 55
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-URI https://asc.fasb.org//1943274/2147480046/944-40-55-29E

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