Derivative Financial Instruments (Details 6) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Other Assets [Member]
Fair value of derivative instruments held for other purposes
Derivative Assets	$ 1,400	$ 1,021
Other Assets [Member] \| Interest rate contracts [Member]
Fair value of derivative instruments held for other purposes
Derivative Assets	1,009	957
Other Assets [Member] \| Foreign exchange contracts [Member]
Fair value of derivative instruments held for other purposes
Derivative Assets	21	11
Other Assets [Member] \| Equity contracts [Member]
Fair value of derivative instruments held for other purposes
Derivative Assets	369	51
Other Assets [Member] \| Credit contracts [Member]
Fair value of derivative instruments held for other purposes
Derivative Assets	1	2
Interest Taxes and Other Liabilities [Member]
Fair value of derivative instruments held for other purposes
Derivative Liabilities	365	214
Interest Taxes and Other Liabilities [Member] \| Interest rate contracts [Member]
Fair value of derivative instruments held for other purposes
Derivative Liabilities	119	106
Interest Taxes and Other Liabilities [Member] \| Foreign exchange contracts [Member]
Fair value of derivative instruments held for other purposes
Derivative Liabilities	22	13
Interest Taxes and Other Liabilities [Member] \| Equity contracts [Member]
Fair value of derivative instruments held for other purposes
Derivative Liabilities	218	87
Interest Taxes and Other Liabilities [Member] \| Credit contracts [Member]
Fair value of derivative instruments held for other purposes
Derivative Liabilities	$ 6	$ 8

Fair values as of the balance sheet date for all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments and which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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-URI http://asc.fasb.org/extlink&oid=6509628

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 43

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-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.

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+ Details

- Definition

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and which are expected to be extinguished or otherwise disposed of within a year or the normal operating cycle, if longer, net of the effects of master netting arrangements.

+ References

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

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FIN39-1

-Paragraph 10A, 10B

-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.

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

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 43

-Section A

-Paragraph 7

-Chapter 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.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-Glossary Current Liabilities

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 4, 17

-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.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

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+ Details