XML 108 R68.htm IDEA: XBRL DOCUMENT v3.19.3
Cash Instruments - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Cash Instruments Assets [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Net gains / (losses) on assets $ 73 $ 603 $ 867 $ 935  
Net realized gains / (losses) on assets 68 122 224 350  
Net unrealized gains / (losses) on assets relating to instruments still held at the reporting date 5 481 643 585  
Cash Instruments Assets [Member] | Equity Securities [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Net realized gains / (losses) on assets 23 42 55 109  
Net unrealized gains / (losses) on assets relating to instruments still held at the reporting date 116 429 557 591  
Cash Instruments Assets [Member] | Market making [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Net gains / (losses) on assets (157) (3) (140) (48)  
Cash Instruments Assets [Member] | Other Principal Transactions [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Net gains / (losses) on assets 139 466 743 621  
Cash Instruments Assets [Member] | Interest Income [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Net gains / (losses) on assets 91 $ 140 264 $ 362  
Cash Instruments Liabilities [Member] | Equity Securities [Member]          
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]          
Equity method investment $ 8,020   $ 8,020   $ 7,910