Summary of Significant Accounting Principles - New Accounting Pronouncements (Details) - USD ($) $ in Millions |
12 Months Ended | |||
|---|---|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | ||||
| Share-based payment award tax benefit | $ 236 | |||
| Investment banking income | 6,011 | $ 5,241 | $ 5,572 | |
| Noninterest expense | $ 54,743 | $ 55,083 | $ 57,617 | |
| Accounting Standards Update 2014-14 | Forecast | ||||
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | ||||
| Investment banking income | $ 200 | |||
| Noninterest expense | $ 200 | |||
| X | ||||||||||
- Definition Effective Income Tax Rate Reconciliation Share-based Compensation Excess Tax Benefit Amount No definition available.
|
| X | ||||||||||
- Definition Includes (1) underwriting revenue (the spread between the resale price received and the cost of the securities and related expenses) generated through the purchasing, distributing and reselling of new issues of securities (alternatively, could be a secondary offering of a large block of previously issued securities); and (2) fees earned for mergers, acquisitions, divestitures, restructurings, and other types of financial advisory services. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Total aggregate amount of all noninterest expense. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|