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Claim and Claim Adjustment Expense Reserves and Future Policy Benefit Reserves - Life & Group Policyholder Reserves (Details) - USD ($) $ in Millions | 3 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |
Pretax margin included in long term care future policy benefit reserves | $ 125 | $ 72
CNA Financial | Release of IBNR Reserves and Higher Claim Severity |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |
Pretax reductions in claim tax and claim adjustment expense reserves | (25) |
CNA Financial | Release of IBNR Reserves |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |
Pretax reductions in claim tax and claim adjustment expense reserves | (107) |
CNA Financial | Higher Claim Severity |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |
Pretax reductions in claim tax and claim adjustment expense reserves | 82 |
CNA Financial | Lower Discount Rate Assumptions and Mortality Assumption Changes |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |
Pretax reductions in claim tax and claim adjustment expense reserves | $ (5) | 2
CNA Financial | Lower Claim Severity |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |
Pretax reductions in claim tax and claim adjustment expense reserves |  | $ (40)

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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. + Details
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- Definition Amount of increase (decrease) in liability to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 + Details
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