EMPLOYEE BENEFIT PLANS - NET PENSION EXPENSE (DETAILS) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Qualified Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 8	$ 12	$ 16	$ 23
Interest cost	20	18	40	36
Expected return on assets	(29)	(28)	(58)	(55)
Amortization of prior service cost	(1)	0	(1)	0
Recognized actuarial loss (gain)	4	11	7	21
Net pension expense	2	13	4	25
Nonqualified Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	0	1	0	1
Interest cost	1	0	1	1
Expected return on assets	0	0	0	0
Amortization of prior service cost	0	0	0	0
Recognized actuarial loss (gain)	0	0	0	0
Net pension expense	1	1	1	2
Postretirement Medical Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	0	1	1	2
Interest cost	1	1	2	2
Expected return on assets	0	0	0	0
Amortization of prior service cost	0	0	0	0
Recognized actuarial loss (gain)	0	0	(1)	0
Net pension expense	$ 1	$ 2	$ 2	$ 4