PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Aggregate Notional Amount of Derivatives (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Notional Amount of Derivatives	$ 2,306	$ 1,889
Equity index instruments
Defined Benefit Plan Disclosure [Line Items]
Notional Amount of Derivatives	569	390
Forward contracts
Defined Benefit Plan Disclosure [Line Items]
Notional Amount of Derivatives	199	208
Swaps
Defined Benefit Plan Disclosure [Line Items]
Notional Amount of Derivatives	$ 1,538	$ 1,291