Claim and Claim Adjustment Expense Reserves (Tables)

3 Months Ended

Mar. 31, 2012

Claim and Claim Adjustment Expense Reserves [Abstract]

Net prior year development

Net Prior Year Development

Three months ended March 31, 2012
(In millions)	CNA Specialty			CNA Commercial			Corporate & Other Non-Core		Total
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development	$	(6	)	$	(14	)	$	2	$	(18	)
Pretax (favorable) unfavorable premium development	(9		)	(17		)	1		(25		)
Total pretax (favorable) unfavorable net prior year development	$	(15	)	$	(31	)	$	3	$	(43	)

Three months ended March 31, 2011
(In millions)	CNA Specialty			CNA Commercial			Corporate & Other Non-Core			Total
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development	$	(15	)	$	(7	)	$	3		$	(19	)
Pretax (favorable) unfavorable premium development	(7		)	(8		)	(1		)	(16		)
Total pretax (favorable) unfavorable net prior year development	$	(22	)	$	(15	)	$	2		$	(35	)

Net prior year claim and allocated claim adjustment expense reserve development for CNA Specialty segment

Three months ended March 31
(In millions)	2012			2011
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development:
Medical Professional Liability	$	(6	)	$	(14	)
Other Professional Liability	4			6
Surety	1			—
Warranty	(1		)	(10		)
Other	(4		)	3
Total pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development	$	(6	)	$	(15	)

Net prior year claim and allocated claim adjustment expense reserve development for CNA Commercial segment

Three months ended March 31
(In millions)	2012			2011
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development:
Commercial Auto	$	—		$	10
General Liability	8			22
Workers' Compensation	(19		)	8
Property and Other	(3		)	(47		)
Total pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development	$	(14	)	$	(7	)