Derivative Instruments - Credit Derivatives, Protection Sold, Notional and Fair Value (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
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	$ (480,679)	$ (509,252)
Protection sold credit derivatives and credit-related notes ratings/maturity profile - from one to five years	(1,515,091)	(2,014,444)
Protection sold credit derivatives and credit-related notes ratings/maturity profile - more than five years	(104,533)	(122,152)
Total notional amount	(2,100,303)	(2,645,848)
Net fair value	17,675	36,818
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	(323,398)	(368,712)
Protection sold credit derivatives and credit-related notes ratings/maturity profile - from one to five years	(1,118,293)	(1,469,773)
Protection sold credit derivatives and credit-related notes ratings/maturity profile - more than five years	(79,486)	(93,209)
Total notional amount	(1,521,177)	(1,931,694)
Net fair value	19,453	26,066
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	(157,281)	(140,540)
Protection sold credit derivatives and credit-related notes ratings/maturity profile - from one to five years	(396,798)	(544,671)
Protection sold credit derivatives and credit-related notes ratings/maturity profile - more than five years	(25,047)	(28,943)
Total notional amount	(579,126)	(714,154)
Net fair value	(1,778)	10,752
Trading assets
Protection sold credit derivatives and credit related notes ratings/maturity profile
Fair value of receivables	46,444	59,156
Trading assets \| Investment-grade
Protection sold credit derivatives and credit related notes ratings/maturity profile
Fair value of receivables	25,767	31,730
Trading assets \| Noninvestment-grade
Protection sold credit derivatives and credit related notes ratings/maturity profile
Fair value of receivables	20,677	27,426
Trading liabilities
Protection sold credit derivatives and credit related notes ratings/maturity profile
Fair value of payables	(28,769)	(22,338)
Trading liabilities \| Investment-grade
Protection sold credit derivatives and credit related notes ratings/maturity profile
Fair value of payables	(6,314)	(5,664)
Trading liabilities \| Noninvestment-grade
Protection sold credit derivatives and credit related notes ratings/maturity profile
Fair value of payables	$ (22,455)	$ (16,674)

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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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- 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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