Fair Value Option (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Fair Value Option
Fair Value Option Gains/(Losses)	$ 61,000,000	$ 228,000,000	$ (78,000,000)	$ 349,000,000
Total gains/(losses) excluded from fair value option	429,000,000	(1,158,000,000)	(1,075,000,000)	(686,000,000)
Fair Value Option Loans and Lending Commitments
Difference between aggregate contractual principal amount of performing loans and long-term receivable for which the fair value option was elected and related fair value	2,923,000,000		2,923,000,000		3,090,000,000
Fair value of loans on nonaccrual status for which the fair value option was elected	3,392,000,000		3,392,000,000		3,994,000,000
Difference between aggregate contractual principal amount of loans and long-term receivable for which the fair value option was elected and related fair value	27,356,000,000		27,356,000,000		29,743,000,000
Difference between aggregate contractual principal amount of loans on nonaccrual status for which the fair value option was elected and related fair value	24,433,000,000		24,433,000,000		26,653,000,000
Total contractual amount of unfunded commitments for which the fair value option was elected	63,270,000,000		63,270,000,000		51,200,000,000
Fair value of unfunded commitments for which the fair value option was elected	1,700,000,000		1,700,000,000		1,260,000,000
Fair Value, Option, Credit Risk, Gain (Loss) Quantitative Disclosures [Abstract]
Net Gains (Losses), Including Hedges, Attributable to the Impact of Changes in Own Credit Spreads on Borrowings For Which the Fair Value Option Was Elected	85,000,000	390,000,000	126,000,000	497,000,000
Net Gains (Losses), Excluding Hedges, Attributable to the Impact of Changes in Own Credit Spreads on Borrowings For Which the Fair Value Option Was Elected	75,000,000	405,000,000	119,000,000	514,000,000
Net Gains (Losses) Attributable to the Impact of Changes in Instrument-Specific Credit Spreads on Loans and Loan Commitments For Which the Fair Value Option Was Elected	53,000,000	(118,000,000)	809,000,000	952,000,000
Fair Value Option Long Term Debt Instruments
Difference between aggregate contractual principal amount of long-term debt instruments for which the fair value option was elected and related fair value	832,000,000		832,000,000		701,000,000
Difference between aggregate contractual principal amount of unsecured long-term borrowings and the related fair value	538,000,000		538,000,000		349,000,000
Receivables from customers and counterparties at fair value [Member]
Fair Value Option
Fair Value Option Gains/(Losses)	(6,000,000)	(55,000,000)	(5,000,000)	(93,000,000)
Gains (losses) excluded from fair value option gains (losses) on receivables from customers and counterparties related to certain transfers accounted for as receivables rather than purchases	200,000,000		519,000,000
Other Secured Financings At Fair Value [Member]
Fair Value Option
Fair Value Option Gains/(Losses)	29,000,000	58,000,000	33,000,000	54,000,000
Gains (losses) excluded from fair value option gains (losses) on other secured financings related to financings recorded as a result of transactions that were accounted for as secured financings rather than sales	(510,000,000)		(925,000,000)	(5,000,000)
Unsecured Short-Term Borrowings Including Current Portion Of Unsecured Long Term Borrowings At Fair Value [Member]
Fair Value Option
Fair Value Option Gains/(Losses)	24,000,000	61,000,000	31,000,000	74,000,000
Gains/(losses) excluded from fair value option gains/(losses) on unsecured short-term borrowings related to the embedded derivative component of hybrid financial instruments	327,000,000	964,000,000	103,000,000	759,000,000
Unsecured Long-term Borrowings At Fair Value [Member]
Fair Value Option
Fair Value Option Gains/(Losses)	68,000,000	286,000,000	71,000,000	370,000,000
Gains/(losses) excluded from fair value option gains/(losses) on unsecured long-term borrowings related to the embedded derivative component of hybrid financial instruments	432,000,000	(2,166,000,000)	(839,000,000)	(1,591,000,000)
Other Liabilities And Accrued Expenses At Fair Value [Member]
Fair Value Option
Fair Value Option Gains/(Losses)	(64,000,000)	(142,000,000)	(253,000,000)	(73,000,000)
Gains/(losses) excluded from fair value option gains/(losses) on other liabilities and accrued expenses related to subordinated liabilities issued by consolidated VIEs	(20,000,000)	44,000,000	67,000,000	151,000,000
Fair Value Option Other [Member]
Fair Value Option
Fair Value Option Gains/(Losses)	$ 10,000,000	$ 20,000,000	$ 45,000,000	$ 17,000,000