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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, 2022	Dec. 31, 2021
Large Case Pensions
Liability for Future Policy Benefit, Activity [Line Items]
Expected future benefit payments	$ 3,539	$ 3,882
Expected gross premiums	0	0
Long-Term Care
Liability for Future Policy Benefit, Activity [Line Items]
Expected future benefit payments	3,265	3,115
Expected gross premiums	$ 437	$ 478

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- Definition

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

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 55
-Paragraph 29E
-URI https://asc.fasb.org/extlink&oid=126561865&loc=SL117819541-158441

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 50
-Paragraph 6
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-URI https://asc.fasb.org/extlink&oid=124506351&loc=d3e14931-158439

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- Definition

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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 40
-Section 50
-Paragraph 6
-Subparagraph (b)(1)
-URI https://asc.fasb.org/extlink&oid=124506351&loc=d3e14931-158439

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-Section 55
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-URI https://asc.fasb.org/extlink&oid=126561865&loc=SL117819541-158441

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