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Claim and Claim Adjustment Expense Reserves (Tables)
 9 Months Ended
Sep. 30, 2012
Claim and Claim Adjustment Expense Reserves [Abstract]  
Net prior year development
Net Prior Year Development
Three months ended September 30, 2012
CNA
Specialty
 
CNA Commercial
 
Hardy
 
Corporate
& Other
Non-Core
 
Total
(In millions)
 
 
 
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
)

Three months ended September 30, 2011
CNA
Specialty
 
CNA Commercial
 
Corporate
& Other
Non-Core
 
Total
(In millions)
 
 
 
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development
$
(5
)
 
$
(42
)
 
$
11

 
$
(36
)
Pretax (favorable) unfavorable premium development
(26
)
 
(11
)
 
1

 
(36
)
Total pretax (favorable) unfavorable net prior year development
$
(31
)
 
$
(53
)
 
$
12

 
$
(72
)

Nine months ended September 30, 2012
CNA
Specialty
 
CNA Commercial
 
Hardy
 
Corporate
& Other
Non-Core
 
Total
(In millions)
 
 
 
 
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
)

Nine months ended September 30, 2011
CNA
Specialty
 
CNA Commercial
 
Corporate
& Other
Non-Core
 
Total
(In millions)
 
 
 
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development
$
(72
)
 
$
(99
)
 
$
5

 
$
(166
)
Pretax (favorable) unfavorable premium development
(34
)
 
21

 
—

 
(13
)
Total pretax (favorable) unfavorable net prior year development
$
(106
)
 
$
(78
)
 
$
5

 
$
(179
)
Net prior year claim and allocated claim adjustment expense reserve development for CNA Specialty segment
Periods ended September 30
Three Months
 
Nine Months
(In millions)
2012
 
2011
 
2012
 
2011
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development:
 
 
 
 
 
 
 
Medical Professional Liability
$
9

 
$
(18
)
 
$
(6
)
 
$
(52
)
Other Professional Liability
1

 
1

 
(1
)
 
(20
)
Surety
(60
)
 
1

 
(59
)
 
(2
)
Warranty
—

 
—

 
(1
)
 
(12
)
Other
11

 
11

 
(13
)
 
14

Total pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development
$
(39
)
 
$
(5
)
 
$
(80
)
 
$
(72
)
Net prior year claim and allocated claim adjustment expense reserve development for CNA Commercial segment
Periods ended September 30
Three Months
 
Nine Months
(In millions)
2012
 
2011
 
2012
 
2011
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development:
 
 
 
 
 
 
 
Commercial Auto
$
9

 
$
(2
)
 
$
11

 
$
(36
)
General Liability
(21
)
 
4

 
(26
)
 
26

Workers' Compensation
24

 
3

 
13

 
39

Property and Other
(10
)
 
(47
)
 
(23
)
 
(128
)
Total pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development
$
2

 
$
(42
)
 
$
(25
)
 
$
(99
)