| **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**                                                                                                                                                                                                                                            |                     |                 |   |  |   |  |   |  |   |   |   |   |   |  |   |   |
| Net realized investment gains (losses)                                                                                                                                                                                                                  |                     |                 |   |  |   |  |   |  |   |   |   |   | $ 57us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet |  | $ 20us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet | $ 54us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet |
| Other revenues                                                                                                                                                                                                                                          |                     |                 |   |  |   |  |   |  |   |   |   |   | 356us-gaap_OtherIncome |  | 359us-gaap_OtherIncome | 319us-gaap_OtherIncome |
| Total revenues                                                                                                                                                                                                                                          | 2,378us-gaap_Revenues    |                 | 2,411us-gaap_Revenues |  | 2,440us-gaap_Revenues |  | 2,463us-gaap_Revenues |  | 2,569us-gaap_Revenues | 2,458us-gaap_Revenues | 2,450us-gaap_Revenues | 2,455us-gaap_Revenues | 9,692us-gaap_Revenues |  | 9,932us-gaap_Revenues | 9,364us-gaap_Revenues |
| **Claims, Benefits and Expenses**                                                                                                                                                                                                                       |                     |                 |   |  |   |  |   |  |   |   |   |   |   |  |   |   |
| Interest                                                                                                                                                                                                                                                |                     |                 |   |  |   |  |   |  |   |   |   |   | 183us-gaap_InterestExpense |  | 166us-gaap_InterestExpense | 170us-gaap_InterestExpense |
| Income tax expense (benefit)                                                                                                                                                                                                                            |                     |                 |   |  |   |  |   |  |   |   |   |   | (319)us-gaap_IncomeTaxExpenseBenefit |  | (361)us-gaap_IncomeTaxExpenseBenefit | (239)us-gaap_IncomeTaxExpenseBenefit |
| Net income (loss)                                                                                                                                                                                                                                       | 198us-gaap_NetIncomeLoss | [1]             | 213us-gaap_NetIncomeLoss | [1] | 267us-gaap_NetIncomeLoss | [1] | 13us-gaap_NetIncomeLoss | [1] | 221us-gaap_NetIncomeLoss | 272us-gaap_NetIncomeLoss | 194us-gaap_NetIncomeLoss | 250us-gaap_NetIncomeLoss | 691us-gaap_NetIncomeLoss | [1] | 937us-gaap_NetIncomeLoss | 628us-gaap_NetIncomeLoss |
| Total comprehensive income (loss)                                                                                                                                                                                                                       |                     |                 |   |  |   |  |   |  |   |   |   |   | 649us-gaap_ComprehensiveIncomeNetOfTax |  | 548us-gaap_ComprehensiveIncomeNetOfTax | 979us-gaap_ComprehensiveIncomeNetOfTax |
| Parent Company [Member]                                                                                                                                                                                                                                 |                     |                 |   |  |   |  |   |  |   |   |   |   |   |  |   |   |
| **Revenues**                                                                                                                                                                                                                                            |                     |                 |   |  |   |  |   |  |   |   |   |   |   |  |   |   |
| Net investment income                                                                                                                                                                                                                                   |                     |                 |   |  |   |  |   |  |   |   |   |   | 1us-gaap_NetInvestmentIncome/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |  | 1us-gaap_NetInvestmentIncome/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 1us-gaap_NetInvestmentIncome/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Net realized investment gains (losses)                                                                                                                                                                                                                  |                     |                 |   |  |   |  |   |  |   |   |   |   | 4us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |  | 4us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 4us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Other revenues                                                                                                                                                                                                                                          |                     |                 |   |  |   |  |   |  |   |   |   |   |   |  |   | 9us-gaap_OtherIncome/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Total revenues                                                                                                                                                                                                                                          |                     |                 |   |  |   |  |   |  |   |   |   |   | 5us-gaap_Revenues/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |  | 5us-gaap_Revenues/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 14us-gaap_Revenues/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| **Claims, Benefits and Expenses**                                                                                                                                                                                                                       |                     |                 |   |  |   |  |   |  |   |   |   |   |   |  |   |   |
| Administrative and general                                                                                                                                                                                                                              |                     |                 |   |  |   |  |   |  |   |   |   |   | 5us-gaap_GeneralAndAdministrativeExpense/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |  | (7)us-gaap_GeneralAndAdministrativeExpense/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 1us-gaap_GeneralAndAdministrativeExpense/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Interest                                                                                                                                                                                                                                                |                     |                 |   |  |   |  |   |  |   |   |   |   | 182us-gaap_InterestExpense/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |  | 165us-gaap_InterestExpense/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 164us-gaap_InterestExpense/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Total expenses                                                                                                                                                                                                                                          |                     |                 |   |  |   |  |   |  |   |   |   |   | 187us-gaap_OperatingExpenses/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |  | 158us-gaap_OperatingExpenses/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 165us-gaap_OperatingExpenses/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Income (loss) from operations before income taxes and equity in net income of subsidiaries                                                                                                                                                              |                     |                 |   |  |   |  |   |  |   |   |   |   | (182)cna_IncomeLossFromContinuingOperationsBeforeIncomeTaxesAndIncomeLossFromSubsidiaries/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |  | (153)cna_IncomeLossFromContinuingOperationsBeforeIncomeTaxesAndIncomeLossFromSubsidiaries/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | (151)cna_IncomeLossFromContinuingOperationsBeforeIncomeTaxesAndIncomeLossFromSubsidiaries/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Income tax expense (benefit)                                                                                                                                                                                                                            |                     |                 |   |  |   |  |   |  |   |   |   |   | 35us-gaap_IncomeTaxExpenseBenefit/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |  | 22us-gaap_IncomeTaxExpenseBenefit/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 144us-gaap_IncomeTaxExpenseBenefit/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Income (loss) before equity in net income (loss) of subsidiaries                                                                                                                                                                                        |                     |                 |   |  |   |  |   |  |   |   |   |   | (147)cna_IncomeLossFromContinuingOperationsBeforeEquityMethodInvestments/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |  | (131)cna_IncomeLossFromContinuingOperationsBeforeEquityMethodInvestments/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | (7)cna_IncomeLossFromContinuingOperationsBeforeEquityMethodInvestments/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Equity in net income of subsidiaries                                                                                                                                                                                                                    |                     |                 |   |  |   |  |   |  |   |   |   |   | 838cna_EquityInNetIncomeLossOfSubsidiaries/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |  | 1,068cna_EquityInNetIncomeLossOfSubsidiaries/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 635cna_EquityInNetIncomeLossOfSubsidiaries/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Net income (loss)                                                                                                                                                                                                                                       |                     |                 |   |  |   |  |   |  |   |   |   |   | 691us-gaap_NetIncomeLoss/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |  | 937us-gaap_NetIncomeLoss/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 628us-gaap_NetIncomeLoss/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Equity in other comprehensive income of subsidiaries                                                                                                                                                                                                    |                     |                 |   |  |   |  |   |  |   |   |   |   | (42)cna_EquityInOtherComprehensiveIncomeOfSubsidiaries/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |  | (389)cna_EquityInOtherComprehensiveIncomeOfSubsidiaries/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | 351cna_EquityInOtherComprehensiveIncomeOfSubsidiaries/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
| Total comprehensive income (loss)                                                                                                                                                                                                                       |                     |                 |   |  |   |  |   |  |   |   |   |   | $ 649us-gaap_ComprehensiveIncomeNetOfTax/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |  | $ 548us-gaap_ComprehensiveIncomeNetOfTax/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember | $ 979us-gaap_ComprehensiveIncomeNetOfTax/ dei_LegalEntityAxis= us-gaap_ParentCompanyMember |
|                                                                                                                                                                                                                                                         |
| [1]Net income in the first quarter of 2014 includes the impairment loss on the sale of CAC.                                                                                                                                                             |

| X                                                                                                                                                                                                                                                                    |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Equity in net (income) loss of subsidiaries
+ References
No definition available.
+ Details**Name:**cna_EquityInNetIncomeLossOfSubsidiaries**Namespace Prefix:**cna_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                        |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Equity in other comprehensive income of subsidiaries
+ References
No definition available.
+ Details**Name:**cna_EquityInOtherComprehensiveIncomeOfSubsidiaries**Namespace Prefix:**cna_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                            |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Income Loss From Continuing Operations Before Equity Method Investments
+ References
No definition available.
+ Details**Name:**cna_IncomeLossFromContinuingOperationsBeforeEquityMethodInvestments**Namespace Prefix:**cna_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                  |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Income loss from continuing operations before income taxes and income loss from subsidiaries
+ References
No definition available.
+ Details**Name:**cna_IncomeLossFromContinuingOperationsBeforeIncomeTaxesAndIncomeLossFromSubsidiaries**Namespace Prefix:**cna_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563
+ Details**Name:**us-gaap_AvailableForSaleSecuritiesGrossRealizedGainLossNet**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_BenefitsLossesAndExpensesAbstract**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=35737396Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e557-108580Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256
+ Details**Name:**us-gaap_ComprehensiveIncomeNetOfTax**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - 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.
+ 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 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688
+ Details**Name:**us-gaap_GeneralAndAdministrativeExpense**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319
+ Details**Name:**us-gaap_IncomeTaxExpenseBenefit**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of the cost of borrowed funds accounted for as interest expense.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9
+ Details**Name:**us-gaap_InterestExpense**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.18) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.22) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 5Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 20 -Article 9
+ Details**Name:**us-gaap_NetIncomeLoss**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 16 -Article 12Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.2) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 2 -Article 7
+ Details**Name:**us-gaap_NetInvestmentIncome**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
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.
+ References
No definition available.
+ Details**Name:**us-gaap_OperatingExpenses**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Reflects the sum of all other revenue and income recognized by the entity in the period not otherwise specified in the income statement.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.4) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 4 -Article 7
+ Details**Name:**us-gaap_OtherIncome**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).
+ 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=26872669&loc=d3e20235-122688Reference 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 |
| X                                                                                                                                                    |
|------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**us-gaap_RevenuesAbstract**Namespace Prefix:**us-gaap_**Data Type:**xbrli:stringItemType**Balance Type:**na**Period Type:**duration |
| X                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------|
| - Details**Name:**dei_LegalEntityAxis=us-gaap_ParentCompanyMember**Namespace Prefix:****Data Type:**na**Balance Type:****Period Type:** |