CHANGES IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended						3 Months Ended																					6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012 HDFC	Jun. 30, 2012 SPDB	Mar. 31, 2012 Akbank	Jun. 30, 2012 Net unrealized gains (losses) on investment securities	Mar. 31, 2012 Net unrealized gains (losses) on investment securities	Jun. 30, 2011 Net unrealized gains (losses) on investment securities	Mar. 31, 2011 Net unrealized gains (losses) on investment securities	Jun. 30, 2012 Foreign currency translation adjustment, net of hedges	Mar. 31, 2012 Foreign currency translation adjustment, net of hedges	Jun. 30, 2011 Foreign currency translation adjustment, net of hedges	Mar. 31, 2011 Foreign currency translation adjustment, net of hedges	Jun. 30, 2012 Cash flow hedges	Mar. 31, 2012 Cash flow hedges	Jun. 30, 2011 Cash flow hedges	Mar. 31, 2011 Cash flow hedges	Jun. 30, 2012 Pension liability adjustments	Mar. 31, 2012 Pension liability adjustments	Jun. 30, 2011 Pension liability adjustments	Mar. 31, 2011 Pension liability adjustments	Jun. 30, 2012 Accumulated other comprehensive income (loss)	Mar. 31, 2012 Accumulated other comprehensive income (loss)	Jun. 30, 2011 Accumulated other comprehensive income (loss)	Mar. 31, 2011 Accumulated other comprehensive income (loss)	Jun. 30, 2012 Accumulated other comprehensive income (loss) Akbank
Change in accumulated other comprehensive income (loss)
Balance, at the beginning of period					$ (17,788)							$ (809)	$ (35)	$ (1,655)	$ (2,395)	$ (8,954)	$ (10,651)	$ (5,763)	$ (7,127)	$ (2,600)	$ (2,820)	$ (2,498)	$ (2,650)	$ (4,372)	$ (4,282)	$ (4,068)	$ (4,105)	$ (16,735)	$ (17,788)	$ (13,984)	$ (16,277)
Change in net unrealized gains (losses) on investment securities, net of taxes	564		1,052		(210)		1,792					564	(774)	1,052	740													564	(774)	1,052	740
Foreign currency translation adjustment, net of taxes and hedges	(1,596)		776		101		2,140									(1,596)	1,697	776	1,364									(1,596)	1,697	776	1,364
Cash flow hedges, net of taxes	(89)		(69)		131		83													(89)	220	(69)	152					(89)	220	(69)	152
Pension liability adjustment, net of taxes	107	[1]	3	[1]	17	[1]	40	[1]																107	(90)	3	37	107	(90)	3	37
Change	(1,014)		1,762		39		4,055					564	(774)	1,052	740	(1,596)	1,697	776	1,364	(89)	220	(69)	152	107	(90)	3	37	(1,014)	1,053	1,762	2,293
Balance, at the end of period	(17,749)				(17,749)							(245)	(809)	(603)	(1,655)	(10,550)	(8,954)	(4,987)	(5,763)	(2,689)	(2,600)	(2,567)	(2,498)	(4,265)	(4,372)	(4,065)	(4,068)	(17,749)	(16,735)	(12,222)	(13,984)
Reclassification after tax realized gains or losses on sales and impairments of securities					500		(414)
After tax realized gains from sales of minority investments									672	421
Impairment charge related to total investment, after-tax											$ 763																					$ 667

[1] Primarily reflects adjustments based on the final year-end actuarial valuations of the Company's pension and postretirement plans and amortization of amounts previously recognized in other comprehensive income.