PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Liability for deferred pension	Jun. 30, 2012 Liability for deferred income taxes	Jun. 30, 2012 Cumulative other comprehensive loss	Jun. 30, 2012 Registered and Non registered Pension Plans	Jun. 30, 2012 Non-Qualified Pension Plans, Defined Benefit	Jun. 30, 2012 Qualified Pension Plans, Defined Benefit	Dec. 31, 2011 Qualified Pension Plans, Defined Benefit	Jun. 30, 2012 Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Recognized gain for plan amendment	$ (51)	$ 0	$ (103)	$ 0
Increase in fair value of pension assets	15
Pension plan adjustment for net funded status					(23)	9	14
Expected contribution to benefit plans during 2012								$ 87	$ 20	$ 0	$ 60	$ 42