MERGER-RELATED AND RESTRUCTURING COSTS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended	21 Months Ended	57 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013	Sep. 30, 2013
Merger Related And Restructuring Costs Details [Abstract]
Merger-related and restructuring costs	$ 23	$ 32	$ 81	$ 98
Merger-Related Costs
Accrued merger-related costs, balance at beginning of period			14
Costs incurred	2	7	9	50	54	63
Cash paid			(16)	(37)	(40)	(56)
Accrued merger-related costs, balance at end of period	7		7		14	7	7
Remaining liability, current portion	6		6			6	6
Restructuring Costs
Restructuring reserve, balance at beginning of period			27	33	33	33
Costs incurred	21	25	72	48	61		326
Cash paid			(75)	(55)	(67)		(302)
Restructuring reserve, balance at end of period	24		24		27	24	24
Remaining liability, current portion	22		22			22	22
Employee Termination Costs [Member]
Restructuring Costs
Restructuring reserve, balance at beginning of period			24	29	29	29
Costs incurred			59		46
Cash paid			(63)		(51)
Restructuring reserve, balance at end of period	20		20		24	20	20
Other Exit Costs [Member]
Restructuring Costs
Restructuring reserve, balance at beginning of period			3	4	4	4
Costs incurred			13		15
Cash paid			(12)		(16)
Restructuring reserve, balance at end of period	4		4		3	4	4
Employee Termination Costs [Member]
Merger-Related Costs
Accrued merger-related costs, balance at beginning of period			7
Costs incurred			0		22
Cash paid			(4)		(15)
Accrued merger-related costs, balance at end of period	3		3		7	3	3
Other Costs [Member]
Merger-Related Costs
Accrued merger-related costs, balance at beginning of period			7
Costs incurred			9		32
Cash paid			(12)		(25)
Accrued merger-related costs, balance at end of period	$ 4		$ 4		$ 7	$ 4	$ 4