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Business Segments (Income Statement Information) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Operating Revenues |  |
Net earned premiums | $ 1,764 | $ 1,649
Net investment income | 633 | 648
Other revenues | 78 | 68
Total operating revenues | 2,475 | 2,365
Claims, Benefits and Expenses |  |
Net incurred claims and benefits | 1,425 | 1,378
Policyholders' dividends | 4 | 3
Amortization of deferred acquisition costs | 328 | 295
Other insurance related expenses | 262 | 250
Other expenses | 121 | 111
Total claims, benefits and expenses | 2,140 | 2,037
Operating income (loss) before income tax | 335 | 328
Income tax (expense) benefit on operating income (loss) | (104) | (102)
Net operating income (loss) | 231 | 226
Net realized investment gains (losses) | 28 | 36
Income tax (expense) benefit on net realized investment gains (losses) | (9) | (12)
Net realized investment gains (losses), after-tax | 19 | 24
Net income (loss) | 250 | 250
CNA Specialty [Member] |  |
Operating Revenues |  |
Net earned premiums | 723 | 706
Net investment income | 170 | 175
Other revenues | 60 | 56
Total operating revenues | 953 | 937
Claims, Benefits and Expenses |  |
Net incurred claims and benefits | 465 | 468
Policyholders' dividends | 1 | (2)
Amortization of deferred acquisition costs | 150 | 148
Other insurance related expenses | 71 | 72
Other expenses | 54 | 50
Total claims, benefits and expenses | 741 | 736
Operating income (loss) before income tax | 212 | 201
Income tax (expense) benefit on operating income (loss) | (72) | (69)
Net operating income (loss) | 140 | 132
Net realized investment gains (losses) | 3 | 8
Income tax (expense) benefit on net realized investment gains (losses) | (1) | (2)
Net realized investment gains (losses), after-tax | 2 | 6
Net income (loss) | 142 | 138
CNA Commercial [Member] |  |
Operating Revenues |  |
Net earned premiums | 837 | 803
Net investment income | 250 | 265
Other revenues | 10 | 9
Total operating revenues | 1,097 | 1,077
Claims, Benefits and Expenses |  |
Net incurred claims and benefits | 600 | 567
Policyholders' dividends | 2 | 3
Amortization of deferred acquisition costs | 149 | 139
Other insurance related expenses | 143 | 144
Other expenses | 9 | 7
Total claims, benefits and expenses | 903 | 860
Operating income (loss) before income tax | 194 | 217
Income tax (expense) benefit on operating income (loss) | (69) | (78)
Net operating income (loss) | 125 | 139
Net realized investment gains (losses) | 4 | 11
Income tax (expense) benefit on net realized investment gains (losses) | (1) | (4)
Net realized investment gains (losses), after-tax | 3 | 7
Net income (loss) | 128 | 146
Hardy [Member] |  |
Operating Revenues |  |
Net earned premiums | 64 |
Net investment income | 1 |
Other revenues | 1 |
Total operating revenues | 66 |
Claims, Benefits and Expenses |  |
Net incurred claims and benefits | 31 |
Policyholders' dividends |  |
Amortization of deferred acquisition costs | 21 |
Other insurance related expenses | 16 |
Other expenses | 7 |
Total claims, benefits and expenses | 75 |
Operating income (loss) before income tax | (9) |
Income tax (expense) benefit on operating income (loss) | 1 |
Net operating income (loss) | (8) |
Net realized investment gains (losses) | 1 |
Income tax (expense) benefit on net realized investment gains (losses) |  |
Net realized investment gains (losses), after-tax | 1 |
Net income (loss) | (7) |
Life and Group Non-Core [Member] |  |
Operating Revenues |  |
Net earned premiums | 141 | 141
Net investment income | 204 | 198
Other revenues | 4 | (2)
Total operating revenues | 349 | 337
Claims, Benefits and Expenses |  |
Net incurred claims and benefits | 325 | 336
Policyholders' dividends | 1 | 2
Amortization of deferred acquisition costs | 8 | 8
Other insurance related expenses | 33 | 35
Other expenses | 5 | 6
Total claims, benefits and expenses | 372 | 387
Operating income (loss) before income tax | (23) | (50)
Income tax (expense) benefit on operating income (loss) | 23 | 31
Net operating income (loss) |  | (19)
Net realized investment gains (losses) | 14 | 13
Income tax (expense) benefit on net realized investment gains (losses) | (5) | (5)
Net realized investment gains (losses), after-tax | 9 | 8
Net income (loss) | 9 | (11)
Corporate and Other Non-Core [Member] |  |
Operating Revenues |  |
Net earned premiums |  | (1)
Net investment income | 8 | 10
Other revenues | 3 | 5
Total operating revenues | 11 | 14
Claims, Benefits and Expenses |  |
Net incurred claims and benefits | 4 | 7
Policyholders' dividends |  |
Amortization of deferred acquisition costs |  |
Other insurance related expenses |  | (1)
Other expenses | 46 | 48
Total claims, benefits and expenses | 50 | 54
Operating income (loss) before income tax | (39) | (40)
Income tax (expense) benefit on operating income (loss) | 13 | 14
Net operating income (loss) | (26) | (26)
Net realized investment gains (losses) | 6 | 4
Income tax (expense) benefit on net realized investment gains (losses) | (2) | (1)
Net realized investment gains (losses), after-tax | 4 | 3
Net income (loss) | (22) | (23)
Eliminations [Member] |  |
Operating Revenues |  |
Net earned premiums | (1) |
Net investment income |  |
Other revenues |  |
Total operating revenues | (1) |
Claims, Benefits and Expenses |  |
Net incurred claims and benefits |  |
Policyholders' dividends |  |
Amortization of deferred acquisition costs |  |
Other insurance related expenses | (1) |
Other expenses |  |
Total claims, benefits and expenses | (1) |
Operating income (loss) before income tax |  |
Income tax (expense) benefit on operating income (loss) |  |
Net operating income (loss) |  |
Net realized investment gains (losses) |  |
Income tax (expense) benefit on net realized investment gains (losses) |  |
Net realized investment gains (losses), after-tax |  |
Net income (loss) |  |

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