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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.

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No definition available.

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- Definition

Net Prior Year Claim and Allocated Claim Adjustment Expense, Medical Professional Liability

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- Definition

Net Prior Year Claim and Allocated Claim Adjustment Expense, Other

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- Definition

Net Prior Year Claim And Allocated Claim Adjustment Expense Other Professional Liability And Management Liability

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- Definition

Net Prior Year Claim and Allocated Claim Adjustment Expense, Surety

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No definition available.

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- Definition

Net Prior Year Claim and Allocated Claim Adjustment, General Liability

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No definition available.

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- Definition

Net Prior Year Claim and Allocated Claim Adjustment, Workers Compensation

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- Definition

Pretax favorable unfavorable net prior year claim and allocated claim adjustment expense reserve development excluding life group.

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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.

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No definition available.

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