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Claim and Claim Adjustment Expense Reserves (Tables)
 3 Months Ended
Mar. 31, 2013
Claim and Claim Adjustment Expense Reserves [Abstract]  
Net prior year development
Net Prior Year Development
Three months ended March 31, 2013
 
 
 
 
 
 
 
 
 
(In millions)
CNA Specialty
 
CNA Commercial
 
Hardy
 
Corporate
& Other
Non-Core
 
Total
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development
$
(15
)
 
$
(11
)
 
$
(1
)
 
$
1

 
$
(26
)
Pretax (favorable) unfavorable premium development
(8
)
 
(10
)
 
4

 
1

 
(13
)
Total pretax (favorable) unfavorable net prior year development
$
(23
)
 
$
(21
)
 
$
3

 
$
2

 
$
(39
)

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
)
Net prior year claim and allocated claim adjustment expense reserve development for CNA Specialty segment
The following table provides further detail of the net prior year claim and allocated claim adjustment expense reserve development (development) recorded for the CNA Specialty segment for the three months ended March 31, 2013 and 2012.
Three months ended March 31
 
 
 
(In millions)
2013
 
2012
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development:
 
 
 
Medical Professional Liability
$
(3
)
 
$
(6
)
Other Professional Liability
(1
)
 
4

Surety
1

 
1

Warranty
—

 
(1
)
Other
(12
)
 
(4
)
Total pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development
$
(15
)
 
$
(6
)
Net prior year claim and allocated claim adjustment expense reserve development for CNA Commercial segment
The following table provides further detail of the development recorded for the CNA Commercial segment for the three months ended March 31, 2013 and 2012.
Three months ended March 31
 
 
 
(In millions)
2013
 
2012
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development:
 
 
 
Commercial Auto
$
(5
)
 
$
—

General Liability
(21
)
 
8

Workers' Compensation
25

 
(19
)
Property and Other
(10
)
 
(3
)
Total pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development
$
(11
)
 
$
(14
)