| This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity and any gains or losses realized during the period from the sale of investments accounted for under the cost method of accounting and/or investments that are separately or otherwise not categorized as trading, available-for-sale, or held-to-maturity. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. | en-US | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Realized Gain (Loss) on Marketable Securities, Cost Method Investments, and Other Investments | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Realized Gain (Loss) on Marketable Securities, Cost Method Investments, and Other Investments, Total | en-US | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |