| **Schedule II. Condensed Financial Information of Registrant (Parent Company) (Schedule of Condensed Financial Information of Registrant, Statements of Operations and Comprehensive Income) (Details) (USD $)In Millions, unless otherwise specified** | 3 Months Ended | 12 Months Ended |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Revenues**                                                                                                                                                                                                                                            |           |            |   |   |   |   |   |   |   |   |   |
| Other revenues                                                                                                                                                                                                                                          |           |            |   |   |   |   |   |   | $ 320 | $ 294 | $ 292 |
| Total revenues                                                                                                                                                                                                                                          | 2,434          | 2,466           | 2,246 | 2,401 | 2,261 | 2,175 | 2,198 | 2,315 | 9,547 | 8,949 | 9,209 |
| **Expenses**                                                                                                                                                                                                                                            |           |            |   |   |   |   |   |   |   |   |   |
| Interest                                                                                                                                                                                                                                                |           |            |   |   |   |   |   |   | 170 | 175 | 157 |
| Income tax expense (benefit)                                                                                                                                                                                                                            |           |            |   |   |   |   |   |   | 244 | 242 | 332 |
| Net income (loss) attributable to CNA                                                                                                                                                                                                                   | (9)            | 221             | 166 | 250 | 193 | 75 | 124 | 220 | 628 | 612 | 691 |
| Total comprehensive income (loss) attributable to CNA                                                                                                                                                                                                   |           |            |   |   |   |   |   |   | 979 | 755 | 1,340 |
| Parent Company [Member]                                                                                                                                                                                                                                 |           |            |   |   |   |   |   |   |   |   |   |
| **Revenues**                                                                                                                                                                                                                                            |           |            |   |   |   |   |   |   |   |   |   |
| Net investment income                                                                                                                                                                                                                                   |           |            |   |   |   |   |   |   | 1 | 1 | 4 |
| Net realized investment gains (losses)                                                                                                                                                                                                                  |           |            |   |   |   |   |   |   | 4 | (9) | (1) |
| Other revenues                                                                                                                                                                                                                                          |           |            |   |   |   |   |   |   | 9 | 40 | 96 |
| Total revenues                                                                                                                                                                                                                                          |           |            |   |   |   |   |   |   | 14 | 32 | 99 |
| **Expenses**                                                                                                                                                                                                                                            |           |            |   |   |   |   |   |   |   |   |   |
| Administrative and general                                                                                                                                                                                                                              |           |            |   |   |   |   |   |   | 1 | 3 | 5 |
| Interest                                                                                                                                                                                                                                                |           |            |   |   |   |   |   |   | 164 | 167 | 148 |
| Total expenses                                                                                                                                                                                                                                          |           |            |   |   |   |   |   |   | 165 | 170 | 153 |
| Income (loss) from operations before income taxes and equity in net income of subsidiaries                                                                                                                                                              |           |            |   |   |   |   |   |   | (151) | (138) | (54) |
| Income tax expense (benefit)                                                                                                                                                                                                                            |           |            |   |   |   |   |   |   | (144) | (46) | (19) |
| Income (loss) before equity in net income (loss) of subsidiaries                                                                                                                                                                                        |           |            |   |   |   |   |   |   | (7) | (92) | (35) |
| Equity in net income of subsidiaries                                                                                                                                                                                                                    |           |            |   |   |   |   |   |   | 635 | 704 | 726 |
| Net income (loss) attributable to CNA                                                                                                                                                                                                                   |           |            |   |   |   |   |   |   | 628 | 612 | 691 |
| Equity in other comprehensive income of subsidiaries                                                                                                                                                                                                    |           |            |   |   |   |   |   |   | 351 | 143 | 649 |
| Total comprehensive income (loss) attributable to CNA                                                                                                                                                                                                   |           |            |   |   |   |   |   |   | $ 979 | $ 755 | $ 1,340 |

| X                                                                                                                                                                                                                                                                    |
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Equity in net (income) loss of subsidiaries
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Equity in other comprehensive income of subsidiaries
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| - Definition
Income Loss From Continuing Operations Before Equity Method Investments
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Income loss from continuing operations before income taxes and income loss from subsidiaries
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| - Definition
This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.
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| - Definition
The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.
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| - Definition
The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.
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| - Definition
The cost of borrowed funds accounted for as interest that was charged against earnings during the period.
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| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The income earned from investments in securities and property, equipment and other capital assets. It includes rent from property and equipment, dividends from shares in corporations, and interest from bonds, loans, mortgages, derivatives, commercial paper, bank accounts, certificates of deposits, treasuries, and other financial securities. It does not include realized gains and losses on investments.
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Generally recurring costs associated with normal operations except for the portion of these expenses which can be clearly related to production and included in cost of sales or services. Includes selling, general and administrative expense.
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Reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement.
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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.
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