INCOME TAXES - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income tax expense	$ 144	$ 118	$ 258	$ 227
Effective income tax rate	31.10%	32.60%	28.80%	32.70%
U.S. Federal income tax expense and tax rate			35.00%	35.00%
Tax settlement			$ 23
Deferred taxes, net	$ 740		740		$ 714
Unrecognized tax benefits	$ 7		$ 7		$ 42