PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Defined Benefit Plan Disclosure [Line Items]
Recognized gain for plan amendment	$ 0	$ (52)
Canadian Registered and Non registered Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to benefit plans during 2013	88
U.S. Non-Qualified Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to benefit plans during 2013	19
U.S. Qualified Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to benefit plans during 2013	0
U.S. and Canadian Other Postretirement Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to benefit plans during 2013	$ 37