Business Segment Information - Reconciliation of Revenue and Net Income (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Segments’ total revenue, net of interest expense (FTE basis)	$ 85,116	$ 89,801	$ 84,235
Revenues	84,247us-gaap_Revenues	88,942us-gaap_Revenues	83,334us-gaap_Revenues
Reclassification to net income	4,833us-gaap_NetIncomeLoss	11,431us-gaap_NetIncomeLoss	4,188us-gaap_NetIncomeLoss
Year-end total assets	2,104,534us-gaap_Assets	2,102,273us-gaap_Assets
Operating Segments
Segment Reporting Information [Line Items]
Segments’ total revenue, net of interest expense (FTE basis)	85,688	87,073	79,726
Reclassification to net income	4,775	10,669	4,849
Year-end total assets	1,846,486	1,834,751
ALM activities
Segment Reporting Information [Line Items]
Revenues	(804)	(545)	2,266
Reclassification to net income	(343)	(929)	(1,144)
Year-end total assets	658,319	664,519
Equity investment income
Segment Reporting Information [Line Items]
Revenues	729	2,737	1,252
Reclassification to net income	456	1,724	789
Year-end total assets	4,886	5,637
Liquidating businesses and other
Segment Reporting Information [Line Items]
Revenues	(497)	536	991
Reclassification to net income	(55)	(33)	(306)
Year-end total assets	73,018	70,879
FTE basis adjustment
Segment Reporting Information [Line Items]
Revenues	(869)	(859)	(901)
Elimination of segment asset allocations to match liabilities
Segment Reporting Information [Line Items]
Year-end total assets	$ (478,175)	$ (473,513)

Revenue, at full tax equivalent basis, net of interest expense.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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