RECLASSIFICATIONS OUT OF ACCUMULATED OTHER COMPREHENSIVE INCOME - Reclassifications out of Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income	$ 155		$ 120		$ 458		$ 348
Interest expense	(93)		(103)		(262)		(346)
Securities impairment	(1)		(3)		(7)		(7)
Salaries and employee benefits	409		403		1,281		1,261
Income (loss) before income tax expense (benefit)	274		220		985		(3,676)
Income tax expense (benefit)	(85)		(76)		(317)		98
NET INCOME (LOSS)	189		144		668		(3,578)
Amount Reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income tax expense (benefit)	(16)		5		(15)		8
NET INCOME (LOSS)	32		(6)		29		(13)
Reclassification adjustment for net derivative gains (losses) included in net income (loss): | Amount Reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income	18	[1]	18	[1]	54	[1]	38	[1]
Interest expense	(23)	[1]	(48)	[1]	(79)	[1]	(160)	[1]
Other income	0	[2]	0	[2]	0	[2]	(2)	[2]
Income (loss) before income tax expense (benefit)	(5)		(30)		(25)		(124)
Income tax expense (benefit)	(2)		(11)		(9)		(45)
NET INCOME (LOSS)	(3)		(19)		(16)		(79)
Reclassification of net securities gains (losses) to net income (loss): | Amount Reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Securities gains, net	2		25		27		119
Securities impairment	(1)		(3)		(7)		(7)
Income (loss) before income tax expense (benefit)	1		22		20		112
Income tax expense (benefit)	0		7		7		41
NET INCOME (LOSS)	1		15		13		71
Reclassification of changes related to the employee benefit plan: | Amount Reclassified from AOCI
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Salaries and employee benefits	52		(3)		49		(9)
Income (loss) before income tax expense (benefit)	52		(3)		49		(9)
Income tax expense (benefit)	18		(1)		17		(4)
NET INCOME (LOSS)	$ 34		$ (2)		$ 32		$ (5)

[1] This amount includes both (a) the amortization of effective gains and losses associated with the Company's terminated cash flow hedges and (b) the current reporting period's interest settlements realized on the Company's active cash flow hedges. Both (a) and (b) were previously included on the accumulated other comprehensive loss line item on the Consolidated Balance Sheets and were subsequently recorded as adjustments to the interest expense of the underlying hedged item.

[2] This amount represents hedging gains and losses that have been immediately reclassified from accumulated other comprehensive loss based on the probability that the hedged forecasted transactions would not occur by the originally specified time period. This amount is reflected in the other income line item on the Consolidated Statements of Operations.