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Business Segments (Revenues by Line of Business) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
Revenues | $ 2,503 | $ 2,401
CNA Specialty [Domain] |  |
Revenues | 956 | 945
International - Specialty [Member] |  |
Revenues | 59 | 57
Professional & Management Liability [Member] |  |
Revenues | 700 | 694
Surety [Member] |  |
Revenues | 116 | 119
Warranty & Alternative Risks [Member] |  |
Revenues | 81 | 75
CNA Commercial [Domain] |  |
Revenues | 1,101 | 1,088
Commercial Insurance [Member] |  |
Revenues | 826 | 835
International - Commercial [Member] |  |
Revenues | 93 | 91
Small Business [Member] |  |
Revenues | 182 | 162
Hardy [Domain] |  |
Revenues | 67 |
Life & Group Non-Core [Domain] |  |
Revenues | 363 | 350
Health [Member] |  |
Revenues | 298 | 291
Life & Annuity [Member] |  |
Revenues | 61 | 60
Other |  |
Revenues | 4 | (1)
Corporate and Other Non-Core revenues [Member] |  |
Revenues | 17 | 18
Eliminations [Member] |  |
Revenues | $ (1) |

X
- 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