PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Estimated Projected Benefit Payments for the Next 10 Years (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Pension
Defined Benefit Plan Disclosure [Line Items]
Expected Future Benefit Payments in 2013	$ 329
Expected Future Benefit Payments in 2014	338
Expected Future Benefit Payments in 2015	342
Expected Future Benefit Payments in 2016	351
Expected Future Benefit Payments in 2017	359
Expected Future Benefit Payments in 2018-2022	1,897
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Expected Future Benefit Payments in 2013	37
Expected Future Benefit Payments in 2014	34
Expected Future Benefit Payments in 2015	32
Expected Future Benefit Payments in 2016	30
Expected Future Benefit Payments in 2017	29
Expected Future Benefit Payments in 2018-2022	$ 126