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Business Segments (Revenues by Line of Business) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Revenues | $ 2,493 | $ 2,246 | $ 4,996 | $ 4,647
CNA Specialty [Domain] |  |  |  |
Revenues | 954 | 896 | 1,910 | 1,841
International - Specialty [Member] |  |  |  |
Revenues | 59 | 53 | 118 | 110
Professional & Management Liability [Member] |  |  |  |
Revenues | 687 | 645 | 1,387 | 1,339
Surety [Member] |  |  |  |
Revenues | 123 | 121 | 239 | 240
Warranty & Alternative Risks [Member] |  |  |  |
Revenues | 85 | 77 | 166 | 152
CNA Commercial [Domain] |  |  |  |
Revenues | 1,104 | 984 | 2,205 | 2,072
Commercial Insurance [Member] |  |  |  |
Revenues | 827 | 736 | 1,653 | 1,571
International - Commercial [Member] |  |  |  |
Revenues | 90 | 90 | 183 | 181
Small Business [Member] |  |  |  |
Revenues | 187 | 158 | 369 | 320
Hardy [Domain] |  |  |  |
Revenues | 77 |  | 144 |
Life & Group Non-Core [Domain] |  |  |  |
Revenues | 346 | 360 | 709 | 710
Health [Member] |  |  |  |
Revenues | 287 | 287 | 585 | 578
Life & Annuity [Member] |  |  |  |
Revenues | 58 | 57 | 119 | 117
Other |  |  |  |
Revenues | 1 | 16 | 5 | 15
Corporate and Other Non-Core revenues [Member] |  |  |  |
Revenues | 13 | 7 | 30 | 25
Eliminations [Member] |  |  |  |
Revenues | $ (1) | $ (1) | $ (2) | $ (1)

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- Definition Aggregate revenue recognized during the period (derived from goods sold, services rendered, insurance premiums, or other activities that constitute an entity's earning process). For financial services companies, also includes investment and interest income, and sales and trading gains. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration