OTHER FINANCIAL DATA - SHARE-BASED COMPENSATION (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expense, net of tax	$ 7	$ 7	$ 20	$ 22
TSR RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards, granted (in shares)			373,070
EPS RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards, granted (in shares)			94,760
Service-based RSUs [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards, granted (in shares)			95,876
RSUs [Member] | IENova Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity awards, granted (in shares)			378,367