COMMITMENTS AND CONTINGENT LIABILITIES - Additional Information (Detail) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 agreements	Dec. 31, 2012 IBM Mainframe Computer Operations and Support Agreement USD ($)	Dec. 31, 2012 IBM Mainframe Computer Operations and Support Agreement JPY (¥)	Dec. 31, 2012 IBM Distributed Computer Mid Range Server Operations and Support Agreement USD ($)	Dec. 31, 2012 IBM Distributed Computer Mid Range Server Operations and Support Agreement JPY (¥)	Dec. 31, 2012 IBM Application Maintenance and Development Services Agreement USD ($)	Dec. 31, 2012 IBM Application Maintenance and Development Services Agreement JPY (¥)	Dec. 31, 2012 Accenture Application Maintenance and Development Services Agreement USD ($)	Dec. 31, 2012 Accenture Application Maintenance and Development Services Agreement JPY (¥)
Commitments and Contingencies Disclosure [Line Items]
Number of operating service agreements	3
Outsourcing agreements, remaining term		3	3	3	3	5	5	5	5
Outsourcing agreements, aggregate remaining cost		$ 138	¥ 11,900	$ 121	¥ 10,500	$ 97	¥ 8,400	$ 75	¥ 6,500
Operating Leases, lease terms	expire in various years through 2022