Derivative Instruments - Credit Derivatives, Protection Sold, Notional and Fair Value (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Protection sold credit derivatives and credit related notes ratings/maturity profile
Protection sold credit derivatives and credit related notes ratings/maturity profile - less than one year	$ (441,436)	$ (480,679)
Protection sold credit derivatives and credit-related notes ratings/maturity profile - from one to five years	(1,393,957)	(1,515,091)
Protection sold credit derivatives and credit-related notes ratings/maturity profile - more than five years	(134,841)	(104,533)
Total notional amount	(1,970,234)	(2,100,303)
Net fair value	26,621	17,675
Investment-grade
Protection sold credit derivatives and credit related notes ratings/maturity profile
Protection sold credit derivatives and credit related notes ratings/maturity profile - less than one year	(301,079)	(323,398)
Protection sold credit derivatives and credit-related notes ratings/maturity profile - from one to five years	(1,012,598)	(1,118,293)
Protection sold credit derivatives and credit-related notes ratings/maturity profile - more than five years	(101,819)	(79,486)
Total notional amount	(1,415,496)	(1,521,177)
Net fair value	20,542	19,453
Noninvestment-grade
Protection sold credit derivatives and credit related notes ratings/maturity profile
Protection sold credit derivatives and credit related notes ratings/maturity profile - less than one year	(140,357)	(157,281)
Protection sold credit derivatives and credit-related notes ratings/maturity profile - from one to five years	(381,359)	(396,798)
Protection sold credit derivatives and credit-related notes ratings/maturity profile - more than five years	(33,022)	(25,047)
Total notional amount	(554,738)	(579,126)
Net fair value	6,079	(1,778)
Trading liabilities
Protection sold credit derivatives and credit related notes ratings/maturity profile
Fair value of payables	(17,663)	(28,769)
Trading liabilities \| Investment-grade
Protection sold credit derivatives and credit related notes ratings/maturity profile
Fair value of payables	(3,289)	(6,314)
Trading liabilities \| Noninvestment-grade
Protection sold credit derivatives and credit related notes ratings/maturity profile
Fair value of payables	(14,374)	(22,455)
Trading assets
Protection sold credit derivatives and credit related notes ratings/maturity profile
Fair value of receivables	44,284	46,444
Trading assets \| Investment-grade
Protection sold credit derivatives and credit related notes ratings/maturity profile
Fair value of receivables	23,831	25,767
Trading assets \| Noninvestment-grade
Protection sold credit derivatives and credit related notes ratings/maturity profile
Fair value of receivables	$ 20,453	$ 20,677

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Protection sold on credit derivatives and credit-related notes; ratings/maturity profile for maturities for more than five years.

+ References

No definition available.

+ Details

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- Definition

Protection sold on credit derivatives and credit-related notes; ratings/maturity profile for maturities from one to five years.

+ References

No definition available.

+ Details

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- Definition

Protection sold on credit derivatives and credit- related notes; ratings/maturity profile for maturities less than one year.

+ References

No definition available.

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- Definition

Maximum potential amount of future undiscounted payments that could be required under the credit derivative, before reduction for potential recoveries under recourse or collateralization provisions.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4K

-Subparagraph (b)(1)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5708775-113959

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Credit Derivative

-URI http://asc.fasb.org/extlink&oid=6854095

+ Details

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- Definition

Fair value of credit risk derivative asset.

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- Definition

Fair value of credit risk derivative liability.

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+ Details

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- Definition

Fair value of credit risk derivative asset after deduction of credit risk derivative liability.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4K

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5708775-113959

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611

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