GOODWILL AND OTHER INTANGIBLE ASSETS - Definite-lived Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Definite-lived Intangible Assets
Carrying value of definite-lived intangible assets	$ 23	$ 12
Accumulated amortization	49	48
Amortization expense related to the definite-lived intangible assets	6	$ 4	$ 4
Increase in definite-lived intangible assets	17
Amortization expense related to the definite-lived intangible assets, 2016	4
Amortization expense related to the definite-lived intangible assets, 2017	2
Amortization expense related to the definite-lived intangible assets, 2018	2
Amortization expense related to the definite-lived intangible assets, 2019	2
Amortization expense related to the definite-lived intangible assets, 2020	$ 2
Weighted average
Definite-lived Intangible Assets
Weighted average amortization period	6 years	6 years