| Available-for-sale Equity Securities, Amortized Cost Basis | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Available-for-sale Equity Securities, Amortized Cost Basis, Total | en-US | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |
| This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. | en-US | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |