EMPLOYEE STOCK BENEFIT PLANS (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Deferred tax benefit related to stock-based compensation expense	$ 16	$ 14
Unrecognized compensation cost	367
Share based compensation awards, vesting period in years	2 years 7 months 9 days
Stock Options [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense		3
Restricted Stock [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	18	19
Number of shares granted	2.3
Weighted average grant date fair value of grants during the period	$ 37.37
Vesting period of stock-based compensation award, in years	4
Market share units [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	8	6
Number of shares granted	1.0
Weighted average grant date fair value of grants during the period	$ 37.40
Vesting period of stock-based compensation award, in years	4
Long term performance awards [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 23	$ 14
Number of shares granted	2.5
Weighted average grant date fair value of grants during the period	$ 37.40
Vesting period of stock-based compensation award, in years	3