INCOME TAXES - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Goodwill impairment charges representing goodwill not deductible for tax purposes (Percent)		78.40%
State tax settlement (Percent)			2.50%
State operating loss carryforwards	$ 2,000,000,000
Deferred tax asset valuation allowance	157,000,000	193,000,000
Decrease in deferred tax asset valuation allowance	36,000,000
Unrecognized tax benefits that would impact effective tax rate	49,000,000
Interest on unrecognized tax benefits accrued during period	1,000,000	2,000,000	14,000,000
Accrued interest on unrecognized tax benefits	15,000,000	14,000,000	12,000,000
Decreases for tax positions related to settlements with taxing authorities	(20,000,000)	(1,000,000)	(134,000,000)
Effective Income Tax Rate
Goodwill Impairment (Percent)	0.00%	(35.10%)	0.00%
Settlement with State Taxing Authority
Effective Income Tax Rate
Anticipated decrease in unrecognized tax benefits due to settlement with taxing authorities	61,000,000
Accounting Standard Update No. 2014-01 [Member]
Effective Income Tax Rate
Expected impact to tax rate of adoption of new accounting standard in 2015	2.40%
Tax Years Ended Prior to 1988 [Member]
Effective Income Tax Rate
Base year loan loss reserves attributable to prior years	$ 557,000,000