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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Reconciliation of Pension Plan Assets (Details) (Pension, USD $) In Millions, unless otherwise specified				12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Fair Value, Inputs, Level 3	Dec. 31, 2010 Fair Value, Inputs, Level 3	Dec. 31, 2011 Hedge funds Fair Value, Inputs, Level 3	Dec. 31, 2010 Hedge funds Fair Value, Inputs, Level 3	Dec. 31, 2011 Private equity and related funds Fair Value, Inputs, Level 3	Dec. 31, 2010 Private equity and related funds Fair Value, Inputs, Level 3	Dec. 31, 2011 Real estate and related funds Fair Value, Inputs, Level 3	Dec. 31, 2010 Real estate and related funds Fair Value, Inputs, Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets, beginning	$ 4,714	$ 4,773	$ 4,159	$ 3,979	$ 3,915	$ 2,284	$ 2,320	$ 1,575	$ 1,473	$ 120	$ 122
Net realized gains (losses)				89	317	95	161	(6)	146	0	10
Net change in unrealized appreciation (depreciation)				(79)	436	(180)	317	122	120	(21)	(1)
Net purchases, (sales) and (settlements)				192	(689)	237	(514)	(42)	(164)	(3)	(11)
Fair value of plan assets, ending	$ 4,714	$ 4,773	$ 4,159	$ 4,181	$ 3,979	$ 2,436	$ 2,284	$ 1,649	$ 1,575	$ 96	$ 120

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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