v3.4.0.3
Segment and Geographic Information (Selected Financial Information by Segments) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Segment Reporting Information      
Total non-interest revenues $ 6,893 $ 9,311  
Interest income 1,747 1,484  
Interest expense 848 888  
Net interest 899 596  
Net revenues 7,792 9,907  
Income (loss) from continuing operations before income taxes 1,738 2,855  
Provision for (benefit from) income taxes 578 387  
Income from continuing operations 1,160 2,468  
Discontinued operations:      
Income from discontinued operations before income taxes (5) (8)  
Provision for (benefit from) income taxes (2) (3)  
Income (loss) from discontinued operations (3) (5)  
Net income (loss) 1,157 2,463  
Net income applicable to noncontrolling interests 23 69  
Net income (loss) applicable to Morgan Stanley 1,134 2,394  
Segment Reporting Information, Additional Information      
Performance-based fee revenue at risk 422   $ 422
Reduction of fees 23 50  
Intersegment Eliminations      
Segment Reporting Information      
Total non-interest revenues (67) (54)  
Interest income (221) (124)  
Interest expense (221) (124)  
Net interest 0 0  
Net revenues (67) (54)  
Income (loss) from continuing operations before income taxes 0 0  
Provision for (benefit from) income taxes 0 0  
Income from continuing operations 0 0  
Discontinued operations:      
Income from discontinued operations before income taxes 0 0  
Provision for (benefit from) income taxes 0 0  
Income (loss) from discontinued operations 0 0  
Net income (loss) 0 0  
Net income applicable to noncontrolling interests 0 0  
Net income (loss) applicable to Morgan Stanley 0 0  
Institutional Securities      
Segment Reporting Information      
Total non-interest revenues 3,645 5,546  
Interest income 1,053 870  
Interest expense 984 958  
Net interest 69 (88)  
Net revenues 3,714 5,458  
Income (loss) from continuing operations before income taxes 908 1,813  
Provision for (benefit from) income taxes 275 6  
Income from continuing operations 633 1,807  
Discontinued operations:      
Income from discontinued operations before income taxes (5) (8)  
Provision for (benefit from) income taxes (2) (3)  
Income (loss) from discontinued operations (3) (5)  
Net income (loss) 630 1,802  
Net income applicable to noncontrolling interests 39 52  
Net income (loss) applicable to Morgan Stanley 591 1,750  
Segment Reporting Information, Additional Information      
Discrete income tax expense (benefit)   564  
Wealth Management      
Segment Reporting Information      
Total non-interest revenues 2,837 3,145  
Interest income 914 737  
Interest expense 83 48  
Net interest 831 689  
Net revenues 3,668 3,834  
Income (loss) from continuing operations before income taxes 786 855  
Provision for (benefit from) income taxes 293 320  
Income from continuing operations 493 535  
Discontinued operations:      
Income from discontinued operations before income taxes 0 0  
Provision for (benefit from) income taxes 0 0  
Income (loss) from discontinued operations 0 0  
Net income (loss) 493 535  
Net income applicable to noncontrolling interests 0 0  
Net income (loss) applicable to Morgan Stanley 493 535  
Investment Management      
Segment Reporting Information      
Total non-interest revenues 478 674  
Interest income 1 1  
Interest expense 2 6  
Net interest (1) (5)  
Net revenues 477 669  
Income (loss) from continuing operations before income taxes 44 187  
Provision for (benefit from) income taxes 10 61  
Income from continuing operations 34 126  
Discontinued operations:      
Income from discontinued operations before income taxes 0 0  
Provision for (benefit from) income taxes 0 0  
Income (loss) from discontinued operations 0 0  
Net income (loss) 34 126  
Net income applicable to noncontrolling interests (16) 17  
Net income (loss) applicable to Morgan Stanley $ 50 $ 109