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Claim and Claim Adjustment Expense Reserves (Tables) | 3 Months Ended
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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 | )

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