| **Document and Entity Information**     | 9 Months Ended          |             |
|-----------------------------------------|-------------------------|-------------|
||
| **Document Information [Line Items]**   |                    |        |
| Entity Registrant Name                  | CNA FINANCIAL CORP      |        |
| Entity Central Index Key                | 0000021175              |        |
| Current Fiscal Year End Date            | --12-31                 |        |
| Entity Filer Category                   | Large Accelerated Filer |        |
| Document Type                           | 10-Q                    |        |
| Document Period End Date                | Sep. 30,         2012   |        |
| Document Fiscal Year Focus              | 2012                    |        |
| Document Fiscal Period Focus            | Q3                      |        |
| Amendment Flag                          | false                   |        |
| Entity Common Stock, Shares Outstanding |                    | 269,397,139 |

| X                                                                                                                                                                                                                                                                                            |
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End date of current fiscal year in the format --MM-DD.
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| - Definition
This is focus fiscal period of the document report. For a first quarter 2006 quarterly report, which may also provide financial information from prior periods, the first fiscal quarter should be given as the fiscal period focus. Values: FY, Q1, Q2, Q3, Q4, H1, H2, M9, T1, T2, T3, M8, CY.
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| - Definition
This is focus fiscal year of the document report in CCYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006.
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| - Definition
The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented.  If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.
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| - Definition
The type of document being provided (such as 10-K, 10-Q, N-1A, etc). The document type is limited to the same value as the supporting SEC submission type, minus any "/A" suffix. The acceptable values are as follows: S-1, S-3, S-4, S-11, F-1, F-3, F-4, F-9, F-10, 6-K, 8-K, 10, 10-K, 10-Q, 20-F, 40-F, N-1A, 485BPOS, 497, NCSR, N-CSR, N-CSRS, N-Q, 10-KT, 10-QT, 20-FT, POS AM and Other.
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| - Definition
A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.
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| - Definition
Indicate number of shares outstanding of each of registrant's classes of common stock, as of latest practicable date. Where multiple classes exist define each class by adding class of stock items such as Common Class A [Member], Common Class B [Member] onto the Instrument [Domain] of the Entity Listings, Instrument
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| - Definition
Indicate whether the registrant is one of the following: (1) Large Accelerated Filer, (2) Accelerated Filer, (3) Non-accelerated Filer, or (4) Smaller Reporting Company. Definitions of these categories are stated in Rule 12b-2 of the Exchange Act. This information should be based on the registrant's current or most recent filing containing the related disclosure.
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| - Definition
The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.
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