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Claim and Claim Adjustment Expense Reserves - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Insurance [Abstract] |  |  |  |
Loss from catastrophes, net of reinsurance | $ 68 | $ 37 | $ 120 | $ 57
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Pretax (favorable) unfavorable development | 18 | 27 | 31 | 15
Commercial Property and Casualty Operations | CNA Financial |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Pretax (favorable) unfavorable development | (17) | (37) | (4) | (49)
Other Insurance Operations |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Pretax (favorable) unfavorable development | 35 | 64 | 35 | 64
Other Insurance Operations | CNA Financial |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Pretax (favorable) unfavorable development | $ 35 | $ 64 | $ 35 | $ 64

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- Definition Amount, after effects of reinsurance, of increase (decrease) in the liability for unpaid claims and claims adjustment expense. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 + Details
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