Securities Financing Activities - Schedule of secured financing transactions by assets pledged & remaining maturity (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements, gross	$ 290,044	$ 312,525
Securities loaned, gross	22,556	$ 25,927
Mortgage-backed securities
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements, gross	12,790
Securities loaned, gross	0
U.S. Treasury and government agencies
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements, gross	154,377
Securities loaned, gross	5
Obligations of U.S. states and municipalities
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements, gross	1,316
Securities loaned, gross	0
Non-U.S. government debt
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements, gross	80,162
Securities loaned, gross	4,426
Corporate debt securities
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements, gross	21,286
Securities loaned, gross	78
Asset-backed securities
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements, gross	4,394
Securities loaned, gross	0
Equity securities
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements, gross	15,719
Securities loaned, gross	18,047
Overnight and continuous
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements, gross	114,595
Securities loaned, gross	8,320
Up to 30 days
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements, gross	100,082
Securities loaned, gross	708
30 – 90 days
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements, gross	29,955
Securities loaned, gross	793
Greater than 90 days
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements, gross	45,412
Securities loaned, gross	$ 12,735

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- Definition

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

Reference 2: 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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