Fair Value Option (Details 1) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	$ 7,672	$ 2,082	$ 10,074	$ 9,623
Other income (loss) [Member] | Trading Account Assets [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Trading Account Profits (Losses) [Member] | Trading Account Assets [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	(29)	26	44	134
Mortgage Banking Income (Loss) [Member] | Trading Account Assets [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Trading Account Assets [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	(29)	26	44	134
Corporate Loans [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	(448)	93	(320)	141
Corporate Loans [Member] | Other income (loss) [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	(448)	93	(320)	139
Corporate Loans [Member] | Trading Account Profits (Losses) [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option				2
Corporate Loans [Member] | Mortgage Banking Income (Loss) [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Other income (loss) [Member] | Loans held-for-sale [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	(104)	295	148	547
Trading Account Profits (Losses) [Member] | Loans held-for-sale [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	(9)	0	(7)	0
Mortgage Banking Income (Loss) [Member] | Loans held-for-sale [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	1,349	3,077	3,732	8,204
Loans held-for-sale [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	1,236	3,372	3,873	8,751
Other income (loss) [Member] | Securities Financing Agreements [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	206	117	193	215
Trading Account Profits (Losses) [Member] | Securities Financing Agreements [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Mortgage Banking Income (Loss) [Member] | Securities Financing Agreements [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Securities Financing Agreements [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	206	117	193	215
Other income (loss) [Member] | Other assets [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	132	16	162	62
Trading Account Profits (Losses) [Member] | Other assets [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Mortgage Banking Income (Loss) [Member] | Other assets [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Other assets [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	132	16	162	62
Other income (loss) [Member] | Long-term Deposits [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	(48)	4	(83)	(108)
Trading Account Profits (Losses) [Member] | Long-term Deposits [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Mortgage Banking Income (Loss) [Member] | Long-term Deposits [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Long-term Deposits [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	(48)	4	(83)	(108)
Asset-backed Securities [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	58	(35)	(24)	(76)
Asset-backed Securities [Member] | Other income (loss) [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	0		0
Asset-backed Securities [Member] | Trading Account Profits (Losses) [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	0	0	0	0
Asset-backed Securities [Member] | Mortgage Banking Income (Loss) [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	58	(35)	(24)	(76)
Other income (loss) [Member] | Unfunded loan commitments [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	(559)	117	(503)	50
Trading Account Profits (Losses) [Member] | Unfunded loan commitments [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Mortgage Banking Income (Loss) [Member] | Unfunded loan commitments [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Unfunded loan commitments [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	(559)	117	(503)	50
Short-term Debt [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	214	5	307	(190)
Short-term Debt [Member] | Other income (loss) [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	0		0
Short-term Debt [Member] | Trading Account Profits (Losses) [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	214	5	307	(190)
Short-term Debt [Member] | Mortgage Banking Income (Loss) [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Other income (loss) [Member] | Long-term Debt [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	4,506	(190)	4,134	1,211
Trading Account Profits (Losses) [Member] | Long-term Debt [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	2,404	(1,443)	2,291	(567)
Mortgage Banking Income (Loss) [Member] | Long-term Debt [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Long-term Debt [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	6,910	(1,633)	6,425	644
Trading Account Profits (Losses) [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	2,580	(1,412)	2,635	(621)
Mortgage Banking Income (Loss) [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	1,407	3,042	3,708	8,128
Other income (loss) [Member]
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option
Gains (Losses) Relating to Assets and Liabilities Accounted for Using Fair Value Option	$ 3,685	$ 452	$ 3,731	$ 2,116