| **Condensed Consolidated Statements of Equity (Unaudited) (USD $)In Millions**                                                                | Total    | Common stock [Member] | Additional paid-in capital [Member] | Retained earnings [Member] | Accumulated other comprehensive income (loss) [Member] | Treasury stock [Member] | Notes receivable for the issuance of common stock [Member] | Stockholder's Equity [Member] | Noncontrolling interest [Member] |
|-----------------------------------------------------------------------------------------------------------------------------------------------|----------|-----------------------|-------------------------------------|----------------------------|--------------------------------------------------------|-------------------------|------------------------------------------------------------|-------------------------------|----------------------------------|
| Balance at Dec. 31, 2010                                                                                                                      |     | $ 683                 | $ 2,200                             | $ 7,876                    | $ 326                                                  | $ (105)                 | $ (26)                                                     |                          | $ 570                            |
| Cumulative effect adjustment from accounting change for deferred acquisition costs, net of tax (Accounting standards update 2010-26 [Member]) |     |                  |                           | (72)                       |                                              |                    |                                                       |                          | (7)                              |
| Dividends paid to common stockholders                                                                                                         |     |                  |                                | (54)                       |                                                   |                    |                                                       |                          |                             |
| Net income (loss)                                                                                                                             | 358      |                  |                                | 344                        |                                                   |                    |                                                       |                          | 14                               |
| Other comprehensive income (loss)                                                                                                             | 393      |                  |                                |                       | 385                                                    |                    |                                                       |                          | 8                                |
| Stock-based compensation                                                                                                                      |     |                  | 1                                   |                       |                                                   | 3                       |                                                       |                          |                             |
| (Increase) decrease in notes receivable from the issuance of common stock                                                                     |     |                  |                                |                       |                                                   |                    | 3                                                          |                          |                             |
| Acquisition of CNA Surety noncontrolling interest                                                                                             |     |                  | (65)                                |                       | 19                                                     |                    |                                                       |                          | (429)                            |
| Other                                                                                                                                         |     |                  | 2                                   |                       |                                                   |                    |                                                       |                          | (12)                             |
| Balance at Jun. 30, 2011                                                                                                                      | 11,664   | 683                   | 2,138                               | 8,094                      | 730                                                    | (102)                   | (23)                                                       | 11,520                        | 144                              |
| Balance at Dec. 31, 2011                                                                                                                      |     | 683                   | 2,146                               | 8,382                      | 470                                                    | (102)                   | (22)                                                       |                          |                        |
| Cumulative effect adjustment from accounting change for deferred acquisition costs, net of tax (Accounting standards update 2010-26 [Member]) |     |                  | (5)                                 | (74)                       | 10                                                     |                    |                                                       |                          |                        |
| Dividends paid to common stockholders                                                                                                         |     |                  |                                | (81)                       |                                                   |                    |                                                       |                          |                             |
| Net income (loss)                                                                                                                             | 416      |                  |                                | 416                        |                                                   |                    |                                                       |                          |                        |
| Other comprehensive income (loss)                                                                                                             | 387      |                  |                                |                       | 387                                                    |                    |                                                       |                          |                        |
| Stock-based compensation                                                                                                                      |     |                  |                           |                       |                                                   | 3                       |                                                       |                          |                             |
| (Increase) decrease in notes receivable from the issuance of common stock                                                                     |     |                  |                                |                       |                                                   |                    | 1                                                          |                          |                             |
| Acquisition of CNA Surety noncontrolling interest                                                                                             |     |                  |                           |                       |                                              |                    |                                                       |                          |                        |
| Other                                                                                                                                         |     |                  |                           |                       |                                                   |                    |                                                       |                          |                        |
| Balance at Jun. 30, 2012                                                                                                                      | $ 12,214 | $ 683                 | $ 2,141                             | $ 8,643                    | $ 867                                                  | $ (99)                  | $ (21)                                                     | $ 12,214                      |                        |

| X                                                                                                                                                                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Change in Equity related to changes in Notes Receivable from the Issuance of Common Stock
+ References
No definition available.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Stock-based compensation includes compensation expense as well as vesting and exercising of shares
+ References
No definition available.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Equity impact of common stock cash dividends declared by an entity during the period. This element includes paid and unpaid dividends declared during the period.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of the cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents Other Comprehensive Income or Loss, Net of Tax, for the period.  Includes deferred gains or losses on qualifying hedges, unrealized holding gains or losses on available-for-sale securities, minimum pension liability, and cumulative translation adjustment. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total of Stockholders' Equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity including portions attributable to both the parent and noncontrolling interests (previously referred to as minority interest), if any. The entity including portions attributable to the parent and noncontrolling interests is sometimes referred to as the economic entity. This excludes temporary equity and is sometimes called permanent equity.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents movements included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy.
+ References
No definition available.
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