INCOME TAXES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income tax expense	$ 92	$ 163	$ 198	$ 232
Effective income tax rate	32.70%	34.30%	33.20%	32.70%
Federal income tax rate			35.00%	35.00%
Net deferred tax liability	$ 558		$ 558		$ 493