EMPLOYEE BENEFIT PLANS - NET PENSION EXPENSE (DETAILS) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Qualified Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 8	$ 11	$ 24	$ 34
Interest cost	21	19	61	55
Expected return on assets	(30)	(27)	(88)	(82)
Amortization of prior service cost	0	(1)	(1)	(1)
Recognized actuarial loss (gain)	3	11	10	32
Net pension expense	2	13	6	38
Nonqualified Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	0	0	0	1
Interest cost	0	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	0	0	1	2
Postretirement Medical Benefits [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	1	1	2	3
Interest cost	1	1	3	3
Expected return on assets	0	0	0	0
Amortization of prior service cost	0	0	0	0
Recognized actuarial loss (gain)	(1)	0	(2)	0
Net pension expense	$ 1	$ 2	$ 3	$ 6