Securities Financing Activities - Schedule of secured financing transactions by assets pledged & remaining maturity (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	$ 402,465	$ 290,044
Securities loaned and other	22,451	22,556
Securities-For-Securities
Securities Financing Transaction [Line Items]
Securities lending transactions at fair value	9,100	4,400
Overnight and continuous
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	140,318	114,595
Securities loaned and other	13,586	8,320
Up to 30 days
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	157,860	100,082
Securities loaned and other	1,371	708
30 – 90 days
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	55,621	29,955
Securities loaned and other	2,877	793
Greater than 90 days
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	48,666	45,412
Securities loaned and other	4,617	12,735
Mortgage-backed securities
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	10,546	12,790
Securities loaned and other	0	0
U.S. Treasury and government agencies
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	199,030	154,377
Securities loaned and other	0	5
Obligations of U.S. states and municipalities
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	2,491	1,316
Securities loaned and other	0	0
Non-U.S. government debt
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	149,008	80,162
Securities loaned and other	1,279	4,426
Corporate debt securities
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	18,140	21,286
Securities loaned and other	108	78
Asset-backed securities
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	7,721	4,394
Securities loaned and other	0	0
Equity securities
Securities Financing Transaction [Line Items]
Securities sold under repurchase agreements	15,529	15,719
Securities loaned and other	$ 21,064	$ 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
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section 50
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-Publisher FASB
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-Publisher FASB
-Name Accounting Standards Codification
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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
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-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
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-URI http://asc.fasb.org/extlink&oid=49203159

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