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Quarterly Results (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Selected Quarterly Financial Information                      
Total non-interest revenues $ 6,791 $ 5,435 $ 7,102 $ 6,983 $ 5,405 $ 9,658 $ 9,266 $ 7,551 $ 26,311 $ 31,880 [1] $ 30,332 [1]
Net interest 175 (155) (160) (59) 270 145 (66) 7 (199) 356 898
Net revenues 6,966 5,280 6,942 6,924 5,675 9,803 9,200 7,558 26,112 32,236 31,230
Total non-interest expenses 6,107 6,763 6,005 6,722 6,131 6,115 7,229 6,662 25,597 26,137 25,032
Income (loss) from continuing operations before income taxes 859 (1,483) 937 202 (456) 3,688 1,971 896 515 6,099 6,198
Provision for (benefit from) income taxes 8 [2] (525) [2] 224 [3] 54 (298) 1,415 539 (246) (239) [4] 1,410 743
Income (loss) from continuing operations 851 (958) 713 148 (158) 2,273 1,432 1,142 754 4,689 5,455
Discontinued operations:                      
Gain (loss) from discontinued operations (112) [5] (11) [5] 52 [5] 28 [5] (106) [5] (8) [5],[6] (22) [5] (24) [5] (43) [6],[7] (160) [6],[7] 610 [6],[7]
Provision for (benefit from) income taxes (49) [5] (13) [5] 15 [5] 42 [5] (80) [5] (28) [5],[6] 4 [5] (12) [5] (5) [6] (116) [6] 363 [6]
Net gain (loss) from discontinued operations (63) [5] 2 [5] 37 [5] (14) [5] (26) [5] 20 [5],[6] (26) [5] (12) [5] (38) [6] (44) [6] 247 [6],[8]
Net income (loss) 788 (956) 750 134 (184) 2,293 1,406 1,130 716 4,645 5,702
Net income applicable to redeemable noncontrolling interests 116 8 0 0 0 0 0 0 124 0 0
Net income applicable to nonredeemable noncontrolling interests 78 59 159 228 66 94 213 162 524 535 999
Net income (loss) applicable to Morgan Stanley 594 (1,023) 591 (94) (250) 2,199 1,193 968 68 4,110 4,703
Earnings (loss) applicable to Morgan Stanley common shareholders 568 (1,047) 564 (119) (275) 2,153 (558) 736 (30) 2,067 3,594
Earnings (loss) per basic common share:                      
Income (loss) from continuing operations $ 0.33 [9] $ (0.55) [9] $ 0.28 [9] $ (0.05) [9] $ (0.13) [9] $ 1.16 [9] $ (0.36) [9] $ 0.51 [9] $ 0.02 $ 1.28 $ 2.48
Net gain (loss) from discontinued operations $ (0.03) [9] $ 0 [9] $ 0.02 [9] $ (0.01) [9] $ (0.02) [9] $ 0 [9] $ (0.02) [9] $ 0 [9] $ (0.04) $ (0.03) $ 0.16
Earnings (loss) per basic common share $ 0.30 [9] $ (0.55) [9] $ 0.30 [9] $ (0.06) [9] $ (0.15) [9] $ 1.16 [9] $ (0.38) [9] $ 0.51 [9] $ (0.02) $ 1.25 $ 2.64
Earnings (loss) per diluted common share:                      
Income (loss) from continuing operations $ 0.33 [9] $ (0.55) [9] $ 0.28 [9] $ (0.05) [9] $ (0.13) [9] $ 1.14 [9] $ (0.36) [9] $ 0.51 [9] $ 0.02 $ 1.26 $ 2.45
Net gain (loss) from discontinued operations $ (0.04) [9] $ 0 [9] $ 0.01 [9] $ (0.01) [9] $ (0.02) [9] $ 0.01 [9] $ (0.02) [9] $ (0.01) [9] $ (0.04) $ (0.03) $ 0.18
Earnings (loss) per diluted common share $ 0.29 [9] $ (0.55) [9] $ 0.29 [9] $ (0.06) [9] $ (0.15) [9] $ 1.15 [9] $ (0.38) [9] $ 0.50 [9] $ (0.02) $ 1.23 $ 2.63
Dividends declared per common share $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.20 $ 0.20 $ 0.20
Book value per common share $ 30.70 $ 30.53 $ 31.02 $ 30.74 $ 31.42 $ 31.29 $ 30.17 $ 31.45 $ 30.70 $ 31.42  
Overstatement of Tax Benefits Associated with Repatriated Earnings of Foreign Subsidiaries in Prior Periods
                      
Statement [Line Items]                      
Discrete income tax expense (benefit)   82                  
Overstatement (Understatement) of Deferred Tax Assets, Out-of-period
                      
Statement [Line Items]                      
Discrete income tax expense (benefit) 75                    
Net Investment Hedges
                      
Statement [Line Items]                      
Out-of-period pre-tax gain related to the reversal of amounts recorded in accumulated other comprehensive income due to the incorrect application of hedge accounting     300           109    
In-period pre-tax gain related to the reversal of amounts recorded in accumulated other comprehensive income due to the incorrect application of hedge accounting       $ 191              
[1] In the fourth quarter of 2011 and 2010, the Company recognized a pre-tax loss of approximately $108 million and a pre-tax gain of approximately $176 million, respectively, in net revenues upon application of the OIS curve within the Institutional Securities business segment (see Note 4).
[2] The third quarter of 2012 included an out-of-period net tax provision of approximately $82 million primarily related to the overstatement of tax benefits associated with repatriated earnings of a foreign subsidiary in prior periods, while the fourth quarter of 2012 included an out-of-period net tax provision of approximately $75 million primarily related to the overstatement of deferred tax assets associated with partnership investments in prior periods (see Note 22).
[3] The second quarter of 2012 included an out-of-period pre-tax gain of approximately $300 million related to the reversal of amounts recorded in cumulative other comprehensive income due to the incorrect application of hedge accounting on certain derivative contracts previously designated as net investment hedges of certain foreign, non-U.S. dollar denominated subsidiaries. This amount included a pre-tax gain of approximately $191 million related to the first quarter of 2012, with the remainder impacting prior periods (see Note 12)
[4] Results for 2012 included an out-of-period net tax provision of approximately $107 million, attributable to the Asset Management business segment, related to the overstatement of deferred tax assets associated with partnership investments in prior years and an out-of-period net tax provision of approximately $50 million, attributable to the Institutional Securities business segment, related to the overstatement of deferred tax assets associated with repatriated earnings of a foreign subsidiary recorded in prior years (see Note 22).
[5] See Notes 1 and 25 for more information on discontinued operations.
[6] See Notes 1 and 25 for discussion of discontinued operations.
[7] Amounts included eliminations of intersegment activity.
[8] Amounts for 2010 included a loss of $1.2 billion related to the disposition of Revel included within the Institutional Securities business segment, a gain of approximately $570 million related to the Company’s sale of Retail Asset Management within the Asset Management business segment and a gain of $775 million related to the legal settlement with DFS.
[9] Summation of the quarters’ earnings per common share may not equal the annual amounts due to the averaging effect of the number of shares and share equivalents throughout the year.