LOANS AND ALLOWANCE FOR CREDIT LOSSES (Rollforward of Allowance for Credit Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Dec. 31, 2013
Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, beginning of period	$ 1,110,592		$ 971,092		$ 834,337		$ 1,013,469
(Recovery of)/Provision for loan losses	691,034		10,000		1,066,364		26,850
Charge-offs	(637,704)		(78,775)		(815,044)		(169,808)
Recoveries	261,934		22,545		340,199		54,351
Charge-offs, net of recoveries	(375,770)		(56,230)		(474,845)		(115,457)
Allowance for loan losses, end of period	1,425,856		924,862		1,425,856		924,862
Reserve for Unfunded Lending Commitments [Roll Forward]
Reserve for unfunded lending commitments, beginning of period	180,000		210,000		220,000		210,000
(Release of)/ provision for unfunded lending commitments	(5,000)		0		(45,000)		0
Loss on unfunded lending commitments	(4,726)				(4,726)
Reserve for unfunded lending commitments, end of period	170,274		210,000		170,274		210,000
Total allowance for credit losses, end of period	1,596,130		1,134,862		1,596,130		1,134,862
Allowance for Credit Loss, Additional Information [Abstract]
Ending balance, individually evaluated for impairment	205,606	[1]	215,525	[1]	205,606	[1]	215,525	[1]
Ending balance, collectively evaluated for impairment	1,220,250		709,337		1,220,250		709,337
Total financing receivables	75,928,295		50,352,595		75,928,295		50,352,595		50,050,626
Ending balance, evaluated under the fair value option or lower of cost or fair value	1,563,479	[2]	454,262	[2]	1,563,479	[2]	454,262	[2]
Ending balance, individually evaluated for impairment	1,096,867	[1]	1,263,329	[1]	1,096,867	[1]	1,263,329	[1]
Financing receivables, ending balance, collectively evaluated for impairment	73,267,949		48,635,004		73,267,949		48,635,004
Commercial [Member]
Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, beginning of period	434,160		538,116		443,074		580,931
(Recovery of)/Provision for loan losses	(55,784)		(1,954)		(40,496)		(32,798)
Charge-offs	(22,886)		(36,247)		(52,477)		(70,586)
Recoveries	4,321		9,137		9,710		31,505
Charge-offs, net of recoveries	(18,565)		(27,110)		(42,767)		(39,081)
Allowance for loan losses, end of period	359,811		509,052		359,811		509,052
Reserve for Unfunded Lending Commitments [Roll Forward]
Reserve for unfunded lending commitments, beginning of period	180,000		210,000		220,000		210,000
(Release of)/ provision for unfunded lending commitments	(5,000)		0		(45,000)		0
Loss on unfunded lending commitments	(4,726)				(4,726)
Reserve for unfunded lending commitments, end of period	170,274		210,000		170,274		210,000
Total allowance for credit losses, end of period	530,085		719,052		530,085		719,052
Allowance for Credit Loss, Additional Information [Abstract]
Ending balance, individually evaluated for impairment	75,973	[1]	77,242	[1]	75,973	[1]	77,242	[1]
Ending balance, collectively evaluated for impairment	283,838		431,810		283,838		431,810
Total financing receivables	35,054,313		31,740,785		35,054,313		31,740,785
Ending balance, evaluated under the fair value option or lower of cost or fair value	52,320	[2]	0	[2]	52,320	[2]	0	[2]
Ending balance, individually evaluated for impairment	493,556	[1]	501,837	[1]	493,556	[1]	501,837	[1]
Financing receivables, ending balance, collectively evaluated for impairment	34,508,437		31,238,948		34,508,437		31,238,948
Consumer [Member]
Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, beginning of period	631,942		385,893		363,647		407,259
(Recovery of)/Provision for loan losses	752,307		15,570		1,095,475		41,460
Charge-offs	(614,818)		(42,528)		(762,567)		(99,222)
Recoveries	257,613		13,408		330,489		22,846
Charge-offs, net of recoveries	(357,205)		(29,120)		(432,078)		(76,376)
Allowance for loan losses, end of period	1,027,044		372,343		1,027,044		372,343
Reserve for Unfunded Lending Commitments [Roll Forward]
Total allowance for credit losses, end of period	1,027,044		372,343		1,027,044		372,343
Allowance for Credit Loss, Additional Information [Abstract]
Ending balance, individually evaluated for impairment	129,633	[1]	138,283	[1]	129,633	[1]	138,283	[1]
Ending balance, collectively evaluated for impairment	897,411		234,060		897,411		234,060
Total financing receivables	40,873,982		18,611,810		40,873,982		18,611,810
Ending balance, evaluated under the fair value option or lower of cost or fair value	1,511,159	[2]	454,262	[2]	1,511,159	[2]	454,262	[2]
Ending balance, individually evaluated for impairment	603,311	[1]	761,492	[1]	603,311	[1]	761,492	[1]
Financing receivables, ending balance, collectively evaluated for impairment	38,759,512		17,396,056		38,759,512		17,396,056
Unallocated [Member]
Allowance for Loan Losses [Roll Forward]
Allowance for loan losses, beginning of period	44,490		47,083		27,616		25,279
(Recovery of)/Provision for loan losses	(5,489)		(3,616)		11,385		18,188
Charge-offs	0		0		0		0
Recoveries	0		0		0		0
Charge-offs, net of recoveries	0		0		0		0
Allowance for loan losses, end of period	39,001		43,467		39,001		43,467
Reserve for Unfunded Lending Commitments [Roll Forward]
Total allowance for credit losses, end of period	39,001		43,467		39,001		43,467
Allowance for Credit Loss, Additional Information [Abstract]
Ending balance, individually evaluated for impairment	0	[1]	0	[1]	0	[1]	0	[1]
Ending balance, collectively evaluated for impairment	39,001		43,467		39,001		43,467
Total financing receivables	0		0		0		0
Ending balance, evaluated under the fair value option or lower of cost or fair value	0	[2]	0	[2]	0	[2]	0	[2]
Ending balance, individually evaluated for impairment	0	[1]	0	[1]	0	[1]	0	[1]
Financing receivables, ending balance, collectively evaluated for impairment	$ 0		$ 0		$ 0		$ 0

[1] Consumer loans individually evaluated for impairment consists of loans in TDR status

[2] Represents LHFS and those loans for which the Company has elected the fair value option