| **Consolidated Statements of Shareholders' Equity (unaudited) (USD $)In Millions, unless otherwise specified** | Total                                                                            | Common Stock                                                                                                                                       | Additional Paid in Capital                                                                                                                                     | Accumulated Other Comprehensive Loss                                                                                                                                       | Treasury Stock at Cost                                                                                                                               | Retained Earnings                                                                                                                                       |
|----------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------|
| Balance at Beginning of Period at Dec. 31, 2013                                                                | $ 9,184us-gaap_StockholdersEquity                                                | $ 4us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                                    | $ 3,463us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                                | $ (117)us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember                                                | $ (659)us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                                                | $ 6,493us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                                |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**                                                 |                                                                             |                                                                                                                                               |                                                                                                                                                           |                                                                                                                                                                       |                                                                                                                                                 |                                                                                                                                                    |
| Net Income (Loss)                                                                                              | 200us-gaap_NetIncomeLoss                                                         | 0us-gaap_NetIncomeLoss/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                                           | 0us-gaap_NetIncomeLoss/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                                           | 0us-gaap_NetIncomeLoss/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember                                                           | 0us-gaap_NetIncomeLoss/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                                                           | 200us-gaap_NetIncomeLoss/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                                         |
| Stock-based Compensation                                                                                       | 23us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation                     | 0us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                      | 23us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                     | 0us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember                      | 0us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                      | 0us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                      |
| Exercise of Stock Options                                                                                      | 10us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised                      | 0us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                       | 10us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                      | 0us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember                       | 0us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                       | 0us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                       |
| Dividends                                                                                                      | (50)us-gaap_DividendsCommonStockCash                                             | 0us-gaap_DividendsCommonStockCash/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                                | 0us-gaap_DividendsCommonStockCash/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                                | 0us-gaap_DividendsCommonStockCash/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember                                                | 0us-gaap_DividendsCommonStockCash/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                                                | (50)us-gaap_DividendsCommonStockCash/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                             |
| Changes in Treasury Stock, Net                                                                                 | (15)us-gaap_StockRedeemedOrCalledDuringPeriodValue                               | 0us-gaap_StockRedeemedOrCalledDuringPeriodValue/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                  | 0us-gaap_StockRedeemedOrCalledDuringPeriodValue/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                  | 0us-gaap_StockRedeemedOrCalledDuringPeriodValue/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember                                  | (15)us-gaap_StockRedeemedOrCalledDuringPeriodValue/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                               | 0us-gaap_StockRedeemedOrCalledDuringPeriodValue/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                  |
| Tax Benefits Related to Exercise of Stock Options                                                              | 6us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation | 0us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember | 6us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember | 0us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember | 0us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember | 0us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember |
| Net Change in Pension and Other                                                                                | 3us-gaap_OtherComprehensiveIncomeLossNetOfTax                                    | 0us-gaap_OtherComprehensiveIncomeLossNetOfTax/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                    | 0us-gaap_OtherComprehensiveIncomeLossNetOfTax/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                    | 3us-gaap_OtherComprehensiveIncomeLossNetOfTax/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember                                    | 0us-gaap_OtherComprehensiveIncomeLossNetOfTax/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                                    | 0us-gaap_OtherComprehensiveIncomeLossNetOfTax/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                    |
| Balance at End of Period at Mar. 31, 2014                                                                      | 9,361us-gaap_StockholdersEquity                                                  | 4us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                                      | 3,502us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                                  | (114)us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember                                                  | (674)us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                                                  | 6,643us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                                  |
| Balance at Beginning of Period at Dec. 31, 2014                                                                | 10,325us-gaap_StockholdersEquity                                                 | 4us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                                      | 3,624us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                                  | (90)us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember                                                   | (671)us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                                                  | 7,458us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                                  |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**                                                 |                                                                             |                                                                                                                                               |                                                                                                                                                           |                                                                                                                                                                       |                                                                                                                                                 |                                                                                                                                                    |
| Net Income (Loss)                                                                                              | (22)us-gaap_NetIncomeLoss                                                        | 0us-gaap_NetIncomeLoss/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                                           | 0us-gaap_NetIncomeLoss/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                                           | 0us-gaap_NetIncomeLoss/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember                                                           | 0us-gaap_NetIncomeLoss/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                                                           | (22)us-gaap_NetIncomeLoss/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                                        |
| Stock-based Compensation                                                                                       | 21us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation                     | 0us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                      | 21us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                     | 0us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember                      | 0us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                      | 0us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                      |
| Exercise of Stock Options                                                                                      | 4us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised                       | 0us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                       | 4us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                       | 0us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember                       | 0us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                       | 0us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                       |
| Dividends                                                                                                      | (64)us-gaap_DividendsCommonStockCash                                             | 0us-gaap_DividendsCommonStockCash/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                                | 0us-gaap_DividendsCommonStockCash/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                                | 0us-gaap_DividendsCommonStockCash/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember                                                | 0us-gaap_DividendsCommonStockCash/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                                                | (64)us-gaap_DividendsCommonStockCash/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                             |
| Changes in Treasury Stock, Net                                                                                 | (12)us-gaap_StockRedeemedOrCalledDuringPeriodValue                               | 0us-gaap_StockRedeemedOrCalledDuringPeriodValue/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                  | 0us-gaap_StockRedeemedOrCalledDuringPeriodValue/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                  | 0us-gaap_StockRedeemedOrCalledDuringPeriodValue/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember                                  | (12)us-gaap_StockRedeemedOrCalledDuringPeriodValue/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                               | 0us-gaap_StockRedeemedOrCalledDuringPeriodValue/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                  |
| Issuance of Shares of Common Stock to Public, Net of Offering Costs                                            | 1,112us-gaap_StockIssuedDuringPeriodValueNewIssues                               | 0us-gaap_StockIssuedDuringPeriodValueNewIssues/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                   | 1,112us-gaap_StockIssuedDuringPeriodValueNewIssues/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                               | 0us-gaap_StockIssuedDuringPeriodValueNewIssues/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember                                   | 0us-gaap_StockIssuedDuringPeriodValueNewIssues/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                                   | 0us-gaap_StockIssuedDuringPeriodValueNewIssues/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                   |
| Net Change in Pension and Other                                                                                | (7)us-gaap_OtherComprehensiveIncomeLossNetOfTax                                  | 0us-gaap_OtherComprehensiveIncomeLossNetOfTax/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                    | 0us-gaap_OtherComprehensiveIncomeLossNetOfTax/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                    | (7)us-gaap_OtherComprehensiveIncomeLossNetOfTax/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember                                  | 0us-gaap_OtherComprehensiveIncomeLossNetOfTax/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                                    | 0us-gaap_OtherComprehensiveIncomeLossNetOfTax/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                    |
| Balance at End of Period at Mar. 31, 2015                                                                      | $ 11,357us-gaap_StockholdersEquity                                               | $ 4us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_CommonStockMember                                                    | $ 4,761us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_AdditionalPaidInCapitalMember                                                | $ (97)us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_AccumulatedOtherComprehensiveIncomeMember                                                 | $ (683)us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_TreasuryStockMember                                                | $ 7,372us-gaap_StockholdersEquity/ us-gaap_StatementEquityComponentsAxis= us-gaap_RetainedEarningsMember                                                |

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| - Definition
Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.
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| - Definition
Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.
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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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Amount after tax and reclassification adjustments of other comprehensive income (loss).
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.
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| - Definition
Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Value of stock issued as a result of the exercise of stock options.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5
+ Details**Name:**us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
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| - Definition
Equity impact of the value of stock bought back by the entity at the exercise price or redemption price.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644
+ Details**Name:**us-gaap_StockRedeemedOrCalledDuringPeriodValue**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**debit**Period Type:**duration |