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Claim and Claim Adjustment Expense Reserves (Tables)
 6 Months Ended
Jun. 30, 2012
Claim and Claim Adjustment Expense Reserves [Abstract]  
Net prior year development
Net Prior Year Development
Three months ended June 30, 2012
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
$
(35
)
 
$
(13
)
 
$
(4
)
 
$
(52
)
Pretax (favorable) unfavorable premium development
(5
)
 
(19
)
 
1

 
(23
)
Total pretax (favorable) unfavorable net prior year development
$
(40
)
 
$
(32
)
 
$
(3
)
 
$
(75
)

Three months ended June 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
$
(52
)
 
$
(50
)
 
$
(9
)
 
$
(111
)
Pretax (favorable) unfavorable premium development
(1
)
 
40

 
—

 
39

Total pretax (favorable) unfavorable net prior year development
$
(53
)
 
$
(10
)
 
$
(9
)
 
$
(72
)

Six months ended June 30, 2012
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
$
(41
)
 
$
(27
)
 
$
(2
)
 
$
(70
)
Pretax (favorable) unfavorable premium development
(14
)
 
(36
)
 
2

 
(48
)
Total pretax (favorable) unfavorable net prior year development
$
(55
)
 
$
(63
)
 
$
—

 
$
(118
)

Six months ended June 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
$
(67
)
 
$
(57
)
 
$
(6
)
 
$
(130
)
Pretax (favorable) unfavorable premium development
(8
)
 
32

 
(1
)
 
23

Total pretax (favorable) unfavorable net prior year development
$
(75
)
 
$
(25
)
 
$
(7
)
 
$
(107
)
Net prior year claim and allocated claim adjustment expense reserve development for CNA Specialty segment
Periods ended June 30
Three Months
 
Six 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
)
 
$
(20
)
 
$
(15
)
 
$
(34
)
Other Professional Liability
(6
)
 
(27
)
 
(2
)
 
(21
)
Surety
—

 
(3
)
 
1

 
(3
)
Warranty
—

 
(2
)
 
(1
)
 
(12
)
Other
(20
)
 
—

 
(24
)
 
3

Total pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development
$
(35
)
 
$
(52
)
 
$
(41
)
 
$
(67
)
Net prior year claim and allocated claim adjustment expense reserve development for CNA Commercial segment
Periods ended June 30
Three Months
 
Six Months
(In millions)
2012
 
2011
 
2012
 
2011
Pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development:
 
 
 
 
 
 
 
Commercial Auto
$
2

 
$
(44
)
 
$
2

 
$
(34
)
General Liability
(13
)
 
—

 
(5
)
 
22

Workers' Compensation
8

 
28

 
(11
)
 
36

Property and Other
(10
)
 
(34
)
 
(13
)
 
(81
)
Total pretax (favorable) unfavorable net prior year claim and allocated claim adjustment expense reserve development
$
(13
)
 
$
(50
)
 
$
(27
)
 
$
(57
)