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Claim and Claim Adjustment Expense Reserves (Tables)
 9 Months Ended
Sep. 30, 2013
Claim and Claim Adjustment Expense Reserves [Abstract]  
Net prior year development
Net Prior Year Development
Three months ended September 30, 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
$
(74
)
 
$
(3
)
 
$
(6
)
 
$
2

 
$
(81
)
Pretax (favorable) unfavorable premium development
(3
)
 
7

 
1

 
—

 
5

Total pretax (favorable) unfavorable net prior year development
$
(77
)
 
$
4

 
$
(5
)
 
$
2

 
$
(76
)
Three months ended September 30, 2012
 
 
 
 
 
 
 
 
 
(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
$
(39
)
 
$
2

 
$
(6
)
 
$
3

 
$
(40
)
Pretax (favorable) unfavorable premium development
(1
)
 
(5
)
 
—

 
(1
)
 
(7
)
Total pretax (favorable) unfavorable net prior year development
$
(40
)
 
$
(3
)
 
$
(6
)
 
$
2

 
$
(47
)
Nine months ended September 30, 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
$
(130
)
 
$
13

 
$
5

 
$
—

 
$
(112
)
Pretax (favorable) unfavorable premium development
(16
)
 
(8
)
 
7

 
1

 
(16
)
Total pretax (favorable) unfavorable net prior year development
$
(146
)
 
$
5

 
$
12

 
$
1

 
$
(128
)
Nine months ended September 30, 2012
 
 
 
 
 
 
 
 
 
(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
$
(80
)
 
$
(25
)
 
$
(6
)
 
$
1

 
$
(110
)
Pretax (favorable) unfavorable premium development
(15
)
 
(41
)
 
—

 
1

 
(55
)
Total pretax (favorable) unfavorable net prior year development
$
(95
)
 
$
(66
)
 
$
(6
)
 
$
2

 
$
(165
)
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 and nine months ended September 30, 2013 and 2012.
Periods ended September 30
Three Months
 
Nine Months
(In millions)
2013
 
2012
 
2013
 
2012
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development:
 
 
 
 
 
 
 
Medical Professional Liability
$
9

 
$
9

 
$
(11
)
 
$
(6
)
Other Professional Liability
(4
)
 
1

 
(28
)
 
(1
)
Surety
(76
)
 
(60
)
 
(74
)
 
(59
)
Warranty
—

 
—

 
—

 
(1
)
Other
(3
)
 
11

 
(17
)
 
(13
)
Total pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development
$
(74
)
 
$
(39
)
 
$
(130
)
 
$
(80
)
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 and nine months ended September 30, 2013 and 2012.
Periods ended September 30
Three Months

Nine Months
(In millions)
2013

2012

2013

2012
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development:
 
 
 
 
 
 
 
Commercial Auto
$
4

 
$
9

 
$
1

 
$
11

General Liability
(18
)
 
(21
)
 
(24
)
 
(26
)
Workers’ Compensation
26

 
24

 
96

 
13

Property and Other
(15
)
 
(10
)
 
(60
)
 
(23
)
Total pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development
$
(3
)
 
$
2

 
$
13

 
$
(25
)
Net prior year claim and allocated claim adjustment expense reserve development for Hardy segment
The following table provides further detail of the development recorded for the Hardy segment for the three and nine months ended September 30, 2013 and 2012.
Periods ended September 30
Three Months
 
Nine Months
(In millions)
2013
 
2012
 
2013
 
2012
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development:
 
 
 
 
 
 
 
Marine and Aviation
$
—

 
$
1

 
$
3

 
$
1

Non-Marine Property
1

 
(5
)
 
8

 
(5
)
Property Treaty
(5
)
 
—

 
(3
)
 
—

Specialty
(2
)
 
(2
)
 
(3
)
 
(2
)
Total pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development
$
(6
)
 
$
(6
)
 
$
5

 
$
(6
)