Business Changes and Developments (Details 3) (Bear Stearns [Member], USD $) In Millions	May 31, 2008
Assets
Assets acquired	$ 288,768
Liabilities
Liabilities assumed	287,702
Net assets acquired	1,066
Cash and Due from Banks [Member]
Assets
Assets acquired	534
Federal Funds Sold and Securities Purchased under Agreements to Resell [Member]
Assets
Assets acquired	21,204
Securities Borrowed [Member]
Assets
Assets acquired	55,195
Trading assets [Member]
Assets
Assets acquired	136,489
Loans [Member]
Assets
Assets acquired	4,407
Accrued interest and accounts receivable [Member]
Assets
Assets acquired	34,677
Goodwill [Member]
Assets
Assets acquired	885
Other assets [Member]
Assets
Assets acquired	35,377
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member]
Liabilities
Liabilities assumed	54,643
Other borrowed funds [Member]
Liabilities
Liabilities assumed	16,166
Other Liabilities [Member]
Liabilities
Liabilities assumed	78,569
Long-term Debt [Member]
Liabilities
Liabilities assumed	67,015
Trading Liabilities [Member]
Liabilities
Liabilities assumed	24,267
Beneficial Interests [Member]
Liabilities
Liabilities assumed	$ 47,042

Name:	us-gaap_AssetsAbstract
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The amount of acquisition cost of a business combination allocated to assets acquired.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 37

-Subparagraph g

+ Details

Name:	us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquired
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The total purchase price of the acquired entity. This includes cash paid to equity interest holders of the acquired entity, fair value of debt and equity securities issued to equity holders of the acquired entity, and transaction costs paid to third parties to consummate the acquisition.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 35

+ Details

Name:	us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNet
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of acquisition cost of a business combination allocated to liabilities assumed.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 37

-Subparagraph g

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 98-1

+ Details

Name:	us-gaap_BusinessAcquisitionPurchasePriceAllocationLiabilitiesAssumed
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_LiabilitiesAbstract
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration