EMPLOYEE BENEFIT PLANS - NET PENSION EXPENSE (DETAILS) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Qualified Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 11	$ 9	$ 34	$ 29
Interest cost	19	18	55	55
Expected return on assets	(27)	(23)	(82)	(70)
Amortization of prior service cost	(1)	0	(1)	(1)
Recognized actuarial loss	11	10	32	30
Net pension expense	13	14	38	43
Nonqualified Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	0	0	1	1
Interest cost	0	1	1	2
Expected return on assets	0	0	0	0
Amortization of prior service cost	0	0	0	0
Recognized actuarial loss	0	0	0	0
Net pension expense	0	1	2	3
Postretirement Medical Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	1	1	3	3
Interest cost	1	2	3	5
Expected return on assets	0	0	0	0
Amortization of prior service cost	0	0	0	0
Recognized actuarial loss	0	0	0	0
Net pension expense	$ 2	$ 3	$ 6	$ 8