INCOME TAXES - EFFECTIVE INCOME TAX RECONCILIATION (DETAILS) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
U.S. federal tax rate	35.00%	35.00%	35.00%
Income before income tax		$ 514	$ 394
Income (loss) before income tax	816	514	394
Expected tax expense	286	180	138
Nondeductible expenses	4	3	1
State income taxes	21	14	10
Other—net	(3)	1	0
Total tax expense related to income	$ 308	$ 198	$ 149
Effective tax rate	37.70%	38.50%	37.90%