EMPLOYEE BENEFIT PLANS, Benefit Obligation, Plan Assets, and Funded Status (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Pension Benefits [Member]
Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 355	$ 322
Service cost	9	8	8
Interest cost	20	19	19
Plan participants' contributions	0	0
Actuarial (gain) loss	36	24
Benefits paid	(18)	(18)
Amendments	(36)	0
Benefit obligation at end of year	366	355	322
Change in Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	285	260
Actual return on plan assets	(15)	37
Employer contributions	5	6
Benefits paid	(18)	(18)
Fair value of plan assets at end of year	257	285	260
Funded Status and Recognized Liability	(109)	(70)
Accumulated benefit obligation [Abstract]
Accumulated benefit obligation	363	326
Other Post-retirement Benefits [Member]
Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	65	54
Service cost	1	1	1
Interest cost	4	3	3
Plan participants' contributions	2	3
Actuarial (gain) loss	(6)	10
Benefits paid	(6)	(6)
Amendments	0	0
Benefit obligation at end of year	60	65	54
Change in Plan Assets [Roll Forward]
Benefits paid	(6)	(6)
Funded Status and Recognized Liability	(60)	(65)
Non-qualified Benefit Plans [Member]
Change in Plan Assets [Roll Forward]
Funded Status and Recognized Liability	$ 16