PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Recognized gain for plan amendment	$ (52)	$ 0
Registered and Non registered Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to benefit plans during 2012	83
Non-Qualified Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to benefit plans during 2012	20
Qualified Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to benefit plans during 2012	60
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Expected contribution to benefit plans during 2012	$ 42