BENEFITS Benefits - Obligations and Funded Status (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest cost		$ 1	$ 1	$ 1
Fair value of plan assets at beginning of period		118
Fair value of plan assets at end of period		126	118
Other Postretirement Benefit Plan [Member]
Benefit obligation at beginning of period		21	24
Interest cost		1	1
Actuarial (gain) loss		(1)	(2)
Benefits paid, net		(2)	(2)
Change in Benefit Obligations, Dispositions		0	0
Benefit obligation at end of period		19	21	24
Fair value of plan assets at beginning of period		118	114
Return on plan assets and other		2	(1)
Employer contributions		8	7
Change in Plan Assets, Dispositions		0	0
Fair value of plan assets at end of period		126	118	$ 114
Amount overfunded at end of period (1)	[1]	(107)	(97)
Net actuarial loss		(7)	(10)
Prior service cost		14	14
Amounts recognized in accumulated other comprehensive income (pre-tax basis) consist of:		$ 7	$ 4

[1] Recorded as a non-current asset in the consolidated balance sheets.