Securities Financing Activities - Types of Financial Assets Pledged and Remaining Maturity (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements, gross	$ 339,174	$ 290,044
Securities loaned and other	18,186	22,556
Securities-for-Securities
Securities Financing Transaction [Line Items]
Lending transactions	4,600	4,400
Overnight and continuous
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements, gross	146,383	114,595
Securities loaned and other	9,946	8,320
Up to 30 days
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements, gross	106,044	100,082
Securities loaned and other	437	708
30 – 90 days
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements, gross	39,026	29,955
Securities loaned and other	1,348	793
Greater than 90 days
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements, gross	47,721	45,412
Securities loaned and other	6,455	12,735
Mortgage-backed securities
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements, gross	19,259	12,790
Securities loaned and other	0	0
U.S. Treasury and government agencies
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements, gross	172,850	154,377
Securities loaned and other	23	5
Obligations of U.S. states and municipalities
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements, gross	1,849	1,316
Securities loaned and other	0	0
Non-U.S. government debt
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements, gross	104,834	80,162
Securities loaned and other	3,108	4,426
Corporate debt securities
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements, gross	22,082	21,286
Securities loaned and other	110	78
Asset-backed securities
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements, gross	5,000	4,394
Securities loaned and other	0	0
Equity securities
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements, gross	13,300	15,719
Securities loaned and other	$ 14,945	$ 18,047

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Amount, after the effects of master netting arrangements, of securities loaned to entities in exchange for collateral. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 405
-Section 55
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=35710563&loc=d3e44140-110984

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
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-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 30
-Section 50
-Paragraph 1A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=55761124&loc=SL6224234-111729

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Amount, before effects of master netting arrangements, of securities loaned to entities in exchange for collateral. Includes liabilities not subject to a master netting arrangement and elected not to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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Amount, before effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and elected not to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Repurchase Agreement Accounted for as a Collateralized Borrowing
-URI http://asc.fasb.org/extlink&oid=49203159

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-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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