DERIVATIVES ACTIVITIES (Details 4) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Derivative gain (loss)
Gains (losses) recognized in Other revenue related to derivatives not designated in a qualifying hedging relationship	$ (320,000,000)	$ 1,301,000,000
Gain (loss) on fair value hedges
Gain (loss) on the derivatives in designated and qualifying fair value hedges	(1,242,000,000)	(1,734,000,000)
Gain (loss) on the hedged item in designated and qualifying fair value hedges	1,020,000,000	1,588,000,000
Hedge ineffectiveness recognized in earnings on designated and qualifying fair value hedges	(235,000,000)	(114,000,000)
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges	13,000,000	(32,000,000)
Pretax change in accumulated other comprehensive income (loss)
Cash flow hedges expected to be reclassified within 12 months	1,000,000,000
Maximum length of time hedged in cash flow hedge	10 years
Interest rate contracts
Derivative gain (loss)
Gains (losses) recognized in Other revenue related to derivatives not designated in a qualifying hedging relationship	(435,000,000)	(235,000,000)
Gain (loss) on fair value hedges
Gain (loss) on the derivatives in designated and qualifying fair value hedges	(1,492,000,000)	(1,245,000,000)
Gain (loss) on the hedged item in designated and qualifying fair value hedges	1,254,000,000	1,114,000,000
Hedge ineffectiveness recognized in earnings on designated and qualifying fair value hedges	(238,000,000)	(109,000,000)
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges		(22,000,000)
Foreign exchange contracts
Derivative gain (loss)
Gains (losses) recognized in Other revenue related to derivatives not designated in a qualifying hedging relationship	544,000,000	1,721,000,000
Gain (loss) on fair value hedges
Gain (loss) on the derivatives in designated and qualifying fair value hedges	250,000,000	(489,000,000)
Gain (loss) on the hedged item in designated and qualifying fair value hedges	(234,000,000)	474,000,000
Hedge ineffectiveness recognized in earnings on designated and qualifying fair value hedges	3,000,000	(5,000,000)
Net gain (loss) excluded from assessment of the effectiveness of fair value hedges	13,000,000	(10,000,000)
Credit derivatives
Derivative gain (loss)
Gains (losses) recognized in Other revenue related to derivatives not designated in a qualifying hedging relationship	(429,000,000)	(185,000,000)
Cash Flow Hedges
Pretax change in accumulated other comprehensive income (loss)
Effective portion of hedges included in AOCI	82,000,000	(147,000,000)
Effective portion of cash flow hedges reclassified from AOCI to earnings	(278,000,000)	(411,000,000)
Cash Flow Hedges | Interest rate contracts
Pretax change in accumulated other comprehensive income (loss)
Effective portion of hedges included in AOCI	13,000,000	(38,000,000)
Effective portion of cash flow hedges reclassified from AOCI to earnings	(238,000,000)	(337,000,000)
Cash Flow Hedges | Foreign exchange contracts
Pretax change in accumulated other comprehensive income (loss)
Effective portion of hedges included in AOCI	69,000,000	(109,000,000)
Effective portion of cash flow hedges reclassified from AOCI to earnings	(40,000,000)	(74,000,000)
Net Investment Hedges
Pretax change in accumulated other comprehensive income (loss)
Effective portion of hedges included in AOCI	$ (2,005,000,000)	$ (884,000,000)