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Fair Value Of Financial Instruments (Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended																																																							3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011		Mar. 31, 2012 Foreign Governments [Member]	Mar. 31, 2011 Foreign Governments [Member]		Mar. 31, 2012 Corporate Obligations [Member]	Mar. 31, 2011 Corporate Obligations [Member]		Mar. 31, 2012 Corporate Obligations [Member] Variable Interest Entity [Member]		Mar. 31, 2011 Corporate Obligations [Member] Variable Interest Entity [Member]		Mar. 31, 2012 Residential Mortgage-Backed Non-Agency [Member]		Mar. 31, 2011 Residential Mortgage-Backed Non-Agency [Member]		Mar. 31, 2012 Residential Mortgage-Backed Non-Agency [Member] Variable Interest Entity [Member]		Mar. 31, 2011 Residential Mortgage-Backed Non-Agency [Member] Variable Interest Entity [Member]		Mar. 31, 2012 Residential Mortgage-Backed Agency [Member]	Mar. 31, 2011 Residential Mortgage-Backed Agency [Member]		Mar. 31, 2012 Commercial Mortgage-Backed [Member]		Mar. 31, 2011 Commercial Mortgage-Backed [Member]		Mar. 31, 2012 Commercial Mortgage-Backed [Member] Variable Interest Entity [Member]		Mar. 31, 2011 Commercial Mortgage-Backed [Member] Variable Interest Entity [Member]	Mar. 31, 2012 Collateralized Debt Obligations [Member]		Mar. 31, 2011 Collateralized Debt Obligations [Member]		Mar. 31, 2012 Collateralized Debt Obligations [Member] Variable Interest Entity [Member]		Mar. 31, 2011 Collateralized Debt Obligations [Member] Variable Interest Entity [Member]		Mar. 31, 2012 Other Asset-Backed [Member]		Mar. 31, 2011 Other Asset-Backed [Member]		Mar. 31, 2012 Other Asset-Backed [Member] Variable Interest Entity [Member]		Mar. 31, 2011 Other Asset-Backed [Member] Variable Interest Entity [Member]		Mar. 31, 2012 State And Municipal Tax-Exempt Bonds [Member]	Mar. 31, 2011 State And Municipal Tax-Exempt Bonds [Member]	Mar. 31, 2011 State And Municipal Taxable Bonds [Member]	Mar. 31, 2012 Perpetual Preferred Securities [Member]		Mar. 31, 2012 Total Other Investments [Member]	Dec. 31, 2011 Total Other Investments [Member]	Mar. 31, 2012 Credit Derivatives [Member]		Mar. 31, 2011 Credit Derivatives [Member]		Mar. 31, 2012 Credit Derivatives [Member] Liabilities Of Consolidated VIEs [Member]		Mar. 31, 2011 Credit Derivatives [Member] Liabilities Of Consolidated VIEs [Member]		Mar. 31, 2012 Interest Rate Derivatives [Member]		Mar. 31, 2011 Interest Rate Derivatives [Member]		Mar. 31, 2012 Currency Derivatives [Member] Liabilities Of Consolidated VIEs [Member]		Mar. 31, 2011 Currency Derivatives [Member] Liabilities Of Consolidated VIEs [Member]		Mar. 31, 2012 Medium-Term Notes [Member]		Mar. 31, 2011 Medium-Term Notes [Member]		Mar. 31, 2012 Variable Interest Entity Notes [Member] Liabilities Of Consolidated VIEs [Member]		Mar. 31, 2011 Variable Interest Entity Notes [Member] Liabilities Of Consolidated VIEs [Member]		Mar. 31, 2012 Loans Receivable [Member] Variable Interest Entity [Member]	Mar. 31, 2011 Loans Receivable [Member] Variable Interest Entity [Member]	Mar. 31, 2012 Loan Repurchase Commitments [Member] Variable Interest Entity [Member]	Mar. 31, 2011 Loan Repurchase Commitments [Member] Variable Interest Entity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning Balance, Fair Value Assets	$ 4,188		$ 4,467		$ 11	$ 11		$ 206	$ 246		$ 69		$ 82		$ 17		$ 48		$ 21		$ 40		$ 8	$ 41		$ 24		$ 41		$ 22		$ 23	$ 60		$ 191		$ 203		$ 245		$ 318		$ 350		$ 67		$ 81		$ 28	$ 36	$ 14	$ 1		$ 10	$ 10																									$ 2,046	$ 2,183	$ 1,077	$ 835
Realized Gains / (Losses), Assets	(132)		(1)					(13)																									(3)		(1)						(116)
Unrealized Gains / (Losses) Included in Earnings, Assets	51		266								1								5		(2)									1		6					3		16						3		(2)																																	39	228	(1)	20
Unrealized Gains / (Losses) Included in OCI, Assets	150		44					17	7						1		5				3		1	1		2		2					6		20		1				121		8								(2)	1
Foreign Exchange Recognized in OCI or Earnings, Assets	1		3		1				2																			1
Purchases, Assets	7		32		6	3			10								7							1				8							2						1		1
Issuances, Assets			12																																																																																12
Settlements, Assets	(86)		(172)		(6)	(2)		(1)	(32)		(1)		(2)		(1)		(5)		(2)		(3)			(1)						(2)			(5)		(29)				(2)		(7)		(9)				(1)		(1)	(2)																														(60)	(84)
Sales, Assets	(228)		(16)					(24)	(12)								(1)							(1)									(2)		(1)						(202)		(1)
Transfers into Level 3, Assets	28	[1]	41	[1]		7	[1]		6	[1]	6	[1]	4	[1]			5	[1]	2	[1]													6	[1]	2	[1]	11	[1]	14	[1]	2	[1]	2	[1]	1	[1]	1	[1]
Transfers out of Level 3, Assets	(42)	[1]	(237)	[1]					(16)	[1]					(3)	[1]	(16)	[1]	(1)	[1]	(20)	[1]		(41)	[1]	(1)	[1]	(1)	[1]	(6)	[1]		(27)	[1]	(61)	[1]			(54)	[1]	(2)	[1]	(28)	[1]								(2)	[1]
Ending Balance, Fair Value Assets	3,937		4,439		12	19		185	211		75		84		14		43		25		18		9			25		51		15		29	35		123		218		219		115		323		71		79		27	34	12			10	10																									2,025	2,327	1,076	867
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Assets still held, Assets	49		270								2								4		1											7					2		16						3		(2)																																	39	228	(1)	20
Beginning Balance, Fair Value Liabilities	7,938		9,916																																																					4,790		4,350		80		768		(3)		(5)		17		14		165		116		2,889		4,673
Realized Gains / (Losses), Liabilities	20		386																																																					20		386
Unrealized Gains / (Losses) Included in Earnings, Liabilities	(137)		2,038																																																					(303)		1,421		2		158		(1)		1		2		(2)		5		39		158		421
Unrealized Gains / (Losses) Included in OCI, Liabilities
Foreign Exchange Recognized in OCI or Earnings, Liabilities	4		8																																																																					4		8
Purchases, Liabilities
Issuances, Liabilities
Settlements, Liabilities	(203)		(527)																																																					(20)		(386)																		(183)		(141)
Sales, Liabilities
Transfers into Level 3, Liabilities		[1]		[1]																																																					[1]		[1]		[1]		[1]		[1]		[1]		[1]		[1]		[1]		[1]		[1]		[1]
Transfers out of Level 3, Liabilities		[1]		[1]																																																					[1]		[1]		[1]		[1]		[1]		[1]		[1]		[1]		[1]		[1]		[1]		[1]
Ending Balance, Fair Value Liabilities	7,622		11,821																																																					4,487		5,771		82		926		(4)		(4)		19		12		174		163		2,864		4,953
Change in Unrealized Gains (Losses) for the Period Included in Earnings for Liabilities still held, Liabilities	$ (112)		$ 2,197																																																					$ (286)		$ 1,580		$ 2		$ 158		$ 7		$ 1		$ 2		$ (2)		$ 5		$ 39		$ 158		$ 421
[1] Transferred in and out at the end of the period.

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The increase (decrease) of liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period. Such increase (decrease) may be comprised of changes in fair value (gains or losses) whether realized or unrealized that have been included in earnings, changed net asset value, or other comprehensive income (a separate component of shareholders' equity); purchases, sales, issuances, or settlements of assets; and net transfers in to or out of this category within the fair value hierarchy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c(1), c(2), c(3)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Purchases that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Sales that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Settlements that have taken place during the period in relation to liabilities measured at fair value and categorized within Level 3 of the fair value hierarchy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

This element represents a liability measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258

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Balance Type:	credit
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