EMPLOYEE STOCK BENEFIT PLANS (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 46	$ 40	$ 95	$ 82
Income tax benefit	18	14	34	28
Unrecognized compensation cost	306		306
Weighted-average period over which unrecognized compensation cost is expected to be recognized			2 years 6 months 0 days
Stock Options [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	1	2	1	5
Restricted Stock [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	19	18	37	37
Number of shares granted			2.4
Weighted average grant date fair value of grants during the period			$ 37.52
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	7	16	13
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
Performance share units [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 18	$ 13	$ 41	$ 27
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