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Claim and Claim Adjustment Expense Reserves - Net Prior Year Claim and Allocated Claim Adjustment Expense Reserve Development (Detail) - CNA Financial [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Medical professional liability | $ 1 | $ 13 | $ 5 | $ (17)
Other professional liability and management liability | (27) | (48) | (96) | (98)
Surety | (82) | (63) | (82) | (63)
Commercial auto | (14) | (12) | (40) | (47)
General liability | 7 | 14 | 6 | (38)
Workers' compensation | 7 | (6) | (39) | 48
Other | (7) | (30) | 19 | (67)
Total pretax (favorable) unfavorable development | $ (115) | $ (132) | $ (227) | $ (282)

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- Definition Net prior year claim and allocated claim adjustment. + References No definition available. + Details
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- Definition Net Prior Year Claim and Allocated Claim Adjustment Expense, Medical Professional Liability + References No definition available. + Details
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- Definition Net Prior Year Claim and Allocated Claim Adjustment Expense, Other + References No definition available. + Details
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- Definition Net Prior Year Claim and Allocated Claim Adjustment Expense, Surety + References No definition available. + Details
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- Definition Net Prior Year Claim and Allocated Claim Adjustment, General Liability + References No definition available. + Details
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- Definition Net Prior Year Claim and Allocated Claim Adjustment, Workers Compensation + References No definition available. + Details
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- Definition Pretax favorable unfavorable net prior year claim and allocated claim adjustment expense reserve development excluding life group. + References No definition available. + Details
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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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- Details
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