EMPLOYEE STOCK BENEFIT PLANS (Additional Information) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Options, Exercises in Period, Total Intrinsic Value	$ 153	$ 154	$ 47
Stock Options [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Unrecognized compensation cost	2
Expected weighted-average period of compensation cost to be recognized	0 years 2 months 13 days
Options, Vested, Fair Value	23	45	73
Restricted Stock Units (RSUs) [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Unrecognized compensation cost	146
Expected weighted-average period of compensation cost to be recognized	2 years 7 months 9 days
Equity Instuments Other Than Options, Granted, Weighted Average Grant Date Fair Value	$ 32.71	$ 26.04	$ 24.80
Equity Instruments Other than Options, Vested in Period, Total Fair Value	74	75	79
Market share units [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Unrecognized compensation cost	31
Expected weighted-average period of compensation cost to be recognized	2 years 8 months 16 days
Equity Instuments Other Than Options, Granted, Weighted Average Grant Date Fair Value	$ 31.85	$ 25.83	$ 24.69
Equity Instruments Other than Options, Vested in Period, Total Fair Value	18	8
Long term performance awards [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Unrecognized compensation cost	32
Expected weighted-average period of compensation cost to be recognized	1 year 4 months 26 days
Equity Instuments Other Than Options, Granted, Weighted Average Grant Date Fair Value	$ 32.33	$ 25.30	$ 23.65
Equity Instruments Other than Options, Vested in Period, Total Fair Value	$ 56	$ 21	$ 56