Fair Value Option (Details) (USD $) In Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2011		Sep. 30, 2010	Sep. 30, 2011		Sep. 30, 2010	Dec. 31, 2010
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	$ 7,672		$ 2,082	$ 10,074		$ 9,623
Corporate Loans [Member] | Other Income [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(448)		93	(320)		139
Short-term Debt [Member] | Other Income [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	0			0
Asset-backed Securities [Member] | Other Income [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	0			0
Other Income [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	3,685		452	3,731		2,116
Other Income [Member] | Trading Account Assets [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)
Other Income [Member] | Loans held-for-sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(104)		295	148		547
Other Income [Member] | Securities Financing Agreements [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	206		117	193		215
Other Income [Member] | Other assets [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	132		16	162		62
Other Income [Member] | Long-term Deposits [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(48)		4	(83)		(108)
Other Income [Member] | Unfunded loan commitments [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(559)		117	(503)		50
Other Income [Member] | Long-term Debt [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	4,506		(190)	4,134		1,211
Corporate Loans [Member] | Trading Account Profits (Losses) [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)						2
Short-term Debt [Member] | Trading Account Profits (Losses) [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	214		5	307		(190)
Asset-backed Securities [Member] | Trading Account Profits (Losses) [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	0		0	0		0
Trading Account Profits (Losses) [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	2,580		(1,412)	2,635		(621)
Trading Account Profits (Losses) [Member] | Trading Account Assets [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(29)		26	44		134
Trading Account Profits (Losses) [Member] | Loans held-for-sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(9)		0	(7)		0
Trading Account Profits (Losses) [Member] | Securities Financing Agreements [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)
Trading Account Profits (Losses) [Member] | Other assets [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)
Trading Account Profits (Losses) [Member] | Long-term Deposits [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)
Trading Account Profits (Losses) [Member] | Unfunded loan commitments [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)
Trading Account Profits (Losses) [Member] | Long-term Debt [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	2,404		(1,443)	2,291		(567)
Corporate Loans [Member] | Mortgage Banking Income (Loss) [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)
Short-term Debt [Member] | Mortgage Banking Income (Loss) [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)
Asset-backed Securities [Member] | Mortgage Banking Income (Loss) [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	58		(35)	(24)		(76)
Mortgage Banking Income (Loss) [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	1,407		3,042	3,708		8,128
Mortgage Banking Income (Loss) [Member] | Trading Account Assets [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)
Mortgage Banking Income (Loss) [Member] | Loans held-for-sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	1,349		3,077	3,732		8,204
Mortgage Banking Income (Loss) [Member] | Securities Financing Agreements [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)
Mortgage Banking Income (Loss) [Member] | Other assets [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)
Mortgage Banking Income (Loss) [Member] | Long-term Deposits [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)
Mortgage Banking Income (Loss) [Member] | Unfunded loan commitments [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)
Mortgage Banking Income (Loss) [Member] | Long-term Debt [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)
Trading Account Assets [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(29)		26	44		134
Fair Value Option Elections
Fair Value Carrying Amount	1,337			1,337			964
Contractual Principal Outstanding	2,693			2,693			1,917
Fair Value Carrying Amount Less Unpaid Principal	(1,356)			(1,356)			(953)
Corporate Loans [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(448)		93	(320)		141
Fair Value Option Elections
Fair Value Carrying Amount	11,224			11,224			3,269
Contractual Principal Outstanding	15,938			15,938			3,638
Fair Value Carrying Amount Less Unpaid Principal	(4,714)			(4,714)			(369)
Loans held-for-sale [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	1,236		3,372	3,873		8,751
Fair Value Option Elections
Fair Value Carrying Amount	11,183			11,183			25,942
Contractual Principal Outstanding	13,070			13,070			28,370
Fair Value Carrying Amount Less Unpaid Principal	(1,887)			(1,887)			(2,428)
Securities Financing Agreements [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	206		117	193		215
Fair Value Option Elections
Fair Value Carrying Amount	129,385			129,385			116,023
Contractual Principal Outstanding	128,852			128,852			115,053
Fair Value Carrying Amount Less Unpaid Principal	533			533			970
Other assets [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	132		16	162		62
Fair Value Option Elections
Fair Value Carrying Amount	361			361			310
Long-term Deposits [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(48)		4	(83)		(108)
Fair Value Option Elections
Fair Value Carrying Amount	3,268			3,268			2,732
Contractual Principal Outstanding	3,071			3,071			2,692
Fair Value Carrying Amount Less Unpaid Principal	197			197			40
Asset-backed Securities [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	58		(35)	(24)		(76)
Fair Value Option Elections
Fair Value Carrying Amount	667			667			706
Contractual Principal Outstanding	1,294			1,294			1,356
Fair Value Carrying Amount Less Unpaid Principal	(627)			(627)			(650)
Unfunded loan commitments [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(559)		117	(503)		50
Fair Value Option Elections
Fair Value Carrying Amount	1,343			1,343			866
Short-term Debt [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	214		5	307		(190)
Fair Value Option Elections
Fair Value Carrying Amount	5,527			5,527			6,472
Contractual Principal Outstanding	5,548			5,548			6,472
Fair Value Carrying Amount Less Unpaid Principal	(21)			(21)			0
Long-term Debt [Member]
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair Value, Option, Changes in Fair Value, Gain (Loss)	6,910		(1,633)	6,425		644
Fair Value Option Elections
Fair Value Carrying Amount	48,235	[1]		48,235	[1]		50,984
Contractual Principal Outstanding	62,054	[1]		62,054	[1]		54,656
Fair Value Carrying Amount Less Unpaid Principal	$ (13,819)	[1]		$ (13,819)	[1]		$ (3,672)

[1] The majority of the difference between the fair value carrying amount and contractual principal outstanding at September 30, 2011 relates to the impact of widening of the Corporation's credit spreads, as well as the fair value of the embedded derivative, where applicable.