v3.10.0.1
Parent Company (Condensed Income Statements and Comprehensive Income Statements) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues                      
Trading                 $ 11,551 $ 11,116 $ 10,209
Other                 2,482 2,385 2,175
Total non-interest revenues $ 7,559 $ 8,936 $ 9,704 $ 10,102 $ 8,505 $ 8,414 $ 8,752 $ 8,974 36,301 34,645 30,933
Interest income                 13,892 8,997 7,016
Interest expense                 10,086 5,697 3,318
Net interest 989 936 906 975 995 783 751 771 3,806 3,300 3,698
Net revenues 8,548 9,872 10,610 11,077 9,500 9,197 9,503 9,745 40,107 37,945 34,631
Non-interest expenses 6,691 7,021 7,501 7,657 7,029 6,715 6,861 6,937 28,870 27,542 25,783
Provision for (benefit from) income taxes 300 696 640 714 1,810 697 846 815 2,350 4,168 2,726
Net income 1,558 2,154 2,467 2,704 663 1,791 1,791 1,971 8,883 6,216 6,123
Other comprehensive income (loss), net of tax:                      
Foreign currency translation adjustments                 (90) 251 (11)
Change in net unrealized gains (losses) on available-for-sale securities                 (272) 41 (269)
Change in net DVA                 1,517 (588) (296)
Comprehensive income                 10,175 5,803 5,447
Net income 1,558 2,154 2,467 2,704 663 1,791 1,791 1,971 8,883 6,216 6,123
Preferred stock dividends and other 170 93 170 93 170 93 170 90 526 523 471
Earnings applicable to Morgan Stanley common shareholders $ 1,361 $ 2,019 $ 2,267 $ 2,575 $ 473 $ 1,688 $ 1,587 $ 1,840 8,222 5,588 5,508
Parent Company                      
Revenues                      
Dividends from subsidiaries                 4,973 2,567 2,448
Trading                 54 (260) 96
Other                 (5) 64 38
Total non-interest revenues                 5,022 2,371 2,582
Interest income                 5,172 3,783 3,008
Interest expense                 4,816 4,079 4,036
Net interest                 356 (296) (1,028)
Net revenues                 5,378 2,075 1,554
Non-interest expenses                 225 240 126
Income before income taxes                 5,153 1,835 1,428
Provision for (benefit from) income taxes                 22 (206) (383)
Net income before undistributed gain of subsidiaries                 5,131 2,041 1,811
Undistributed gain of subsidiaries                 3,617 4,070 4,168
Net income                 8,748 6,111 5,979
Other comprehensive income (loss), net of tax:                      
Foreign currency translation adjustments                 (114) 219 (23)
Change in net unrealized gains (losses) on available-for-sale securities                 (272) 41 (269)
Pensions, postretirement and other                 137 (117) (100)
Change in net DVA                 1,454 (560) (283)
Comprehensive income                 9,953 5,694 5,304
Net income                 8,748 6,111 5,979
Preferred stock dividends and other                 526 523 471
Earnings applicable to Morgan Stanley common shareholders                 8,222 $ 5,588 $ 5,508
Dividends from bank subsidiaries                 $ 3,000