INVESTMENTS (Details 6) (USD $)	3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended		0 Months Ended		3 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Jun. 30, 2012 Akbank	Mar. 31, 2012 Akbank	Sep. 30, 2012 Akbank	Sep. 30, 2013 Akbank	Jun. 28, 2013 Morgan Stanley Smith Barney joint venture	Jun. 21, 2013 Morgan Stanley Smith Barney joint venture	Sep. 30, 2012 Morgan Stanley Smith Barney joint venture	Sep. 30, 2013 Morgan Stanley Smith Barney joint venture	Dec. 31, 2012 Morgan Stanley Smith Barney joint venture	Sep. 16, 2012 Morgan Stanley Smith Barney joint venture	Sep. 11, 2012 Morgan Stanley Smith Barney joint venture	Sep. 30, 2013 Mortgage-backed securities	Dec. 31, 2012 Mortgage-backed securities	Sep. 30, 2013 State and municipal securities	Dec. 31, 2012 State and municipal securities	Sep. 30, 2013 Foreign government	Dec. 31, 2012 Foreign government	Sep. 30, 2013 All Other	Dec. 31, 2012 All Other
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount;
Due within 1 year, carrying value																			$ 8,000,000	$ 14,000,000
After 1 but within 5 years, carrying value																		69,000,000	20,000,000	36,000,000	5,607,000,000	2,987,000,000	752,000,000	728,000,000
After 5 but within 10 years, carrying value																	13,000,000	54,000,000	72,000,000	58,000,000
After 10 years, carrying value																	2,672,000,000	4,586,000,000	1,083,000,000	1,097,000,000			581,000,000	501,000,000
Total carrying value	10,808,000,000		10,808,000,000		10,130,000,000												2,685,000,000	4,709,000,000	1,183,000,000	1,205,000,000	5,607,000,000	2,987,000,000	1,333,000,000	1,229,000,000
Held-to-maturity Securities, Debt Maturities, Fair Value;
Due within 1 year, fair value																			8,000,000	15,000,000
After 1 but within 5 years, fair value																		67,000,000	20,000,000	37,000,000	5,687,000,000	2,987,000,000	863,000,000	802,000,000
After 5 but within 10 years, fair value																	14,000,000	54,000,000	76,000,000	62,000,000
After 10 years, fair value																	2,967,000,000	4,977,000,000	1,077,000,000	1,143,000,000			597,000,000	500,000,000
Total fair value	11,309,000,000		11,309,000,000		10,644,000,000												2,981,000,000	5,098,000,000	1,181,000,000	1,257,000,000	5,687,000,000	2,987,000,000	1,460,000,000	1,302,000,000
Minimum contractual maturities of investments with no stated maturities, included as contractual maturities			10 years
Carrying value of equity method investment															11,300,000,000
Maximum equity method investment ownership percentage							10.00%
Percentage of ownership interest held							20.00%				35.00%	35.00%		35.00%	49.00%
Proceed from selling 14% interest in the joint venture												1,890,000,000
Total charge to earnings related to the investment, pretax				4,700,000,000								4,700,000,000
Total charge to earnings related to the investment, after-tax				2,900,000,000								2,900,000,000
Ownership interest sold by entity (as a percent)						10.10%		10.10%			35.00%	14.00%
Percentage of ownership interest held in the investment which is recorded within marketable equity securities available-for-sale									9.90%
Impairment charge related to investment, pre-tax				3,340,000,000			1,200,000,000	1,181,000,000				3,340,000,000
Impairment charge related to investment, after-tax							763,000,000
100% value of the joint venture																13,500,000,000
Deposit transferred to the buyer of the investment at no premium												4,500,000,000
Premium on deposits													0
Loss on sale of investment, before tax						424,000,000		424,000,000				1,344,000,000
Loss on sale of investment, after tax				800,000,000		274,000,000						800,000,000
Other-than-temporary impairment of the carrying value, pretax				3,400,000,000								3,400,000,000
Other-than-temporary impairment of the carrying value, after-tax				2,100,000,000								2,100,000,000
Amount of equity investment											4,725,000,000
Other financing amount											3,000,000,000
Amount of preferred stock											2,028,000,000
Amount of loan											880,000,000
Dividend income	$ 103,000,000	$ 78,000,000	$ 331,000,000	$ 238,000,000						$ 37,500,000