PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Estimated Projected Benefit Pyaments (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011
Pension
Defined Benefit Plan Disclosure [Line Items]
Expected Future Benefit Payments in 2012	$ 317
Expected Future Benefit Payments in 2013	323
Expected Future Benefit Payments in 2014	331
Expected Future Benefit Payments in 2015	337
Expected Future Benefit Payments in 2016	347
Expected Future Benefit Payments in 2017-2021	1,848
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Expected Future Benefit Payments in 2012	42
Expected Future Benefit Payments in 2013	39
Expected Future Benefit Payments in 2014	36
Expected Future Benefit Payments in 2015	34
Expected Future Benefit Payments in 2016	32
Expected Future Benefit Payments in 2017-2021	$ 140