BUSINESS COMBINATIONS (Pro Forma Information) (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended	3 Months Ended				6 Months Ended
	Jan. 28, 2014	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Business Acquisition [Line Items]
SCUSA Amounts Included, Total Revenue, Net of Total Interest Expense		$ 1,590,034		$ 385,277		$ 2,762,139		$ 781,295
SCUSA Amounts Included, Net Income		202,842		187,927		1,972,745		473,426
Gain attributable to SCUSA shares sold						137,536		0
SCUSA [Member]
Business Acquisition [Line Items]
SCUSA Amounts Included, Total Revenue, Net of Total Interest Expense		1,629,613	[1]			2,681,493	[1]
SCUSA Amounts Included, Net Income		302,013				574,747
Supplemental Pro Forma, Total Revenue, Net of Total Interest Expense		2,048,393	[1],[2]	1,801,679	[1],[2]	4,020,599	[1],[2]	5,698,465	[1],[2],[3]
Supplemental Pro Forma, Net Income		224,502	[2]	451,179	[2]	368,940	[2]	2,496,624	[2],[3]
Gain attributable to SCUSA shares sold	137,536
SCUSA [Member] | Combined Total Revenue, Net of Total Interest Expense [Member]
Business Acquisition [Line Items]
Gain attributable to SCUSA shares sold								2,430,000
SCUSA [Member] | Net Income (Loss) [Member]
Business Acquisition [Line Items]
Gain attributable to SCUSA shares sold								$ 1,530,000

[1] Total Revenue, Net of Total Interest Expense is calculated as the sum of Total Interest Income and Total Non-Interest Income, less Total Interest Expense.

[2] Includes the impact of recording provision for loan losses necessary to bring the retail installment contracts and personal unsecured loans to their expected carrying values considering the required allowance for loan losses on their recorded investment amounts. See Note 1 for a related discussion of the Company's accounting policy specific to these loans.

[3] Included within the Supplemental Pro Forma - Combined Total Revenue, Net of Total Interest Expense and Net Income for the six months ended June 30, 2013 are a non-recurring gains of $2.43 billion and $1.53 billion, respectively, that arose on the remeasurment of SHUSA's equity method investment in SCUSA to fair value.