Earnings per Common Share (Calculation of Basic and Diluted EPS) (Details) - USD ($) $ / shares in Units, shares in Millions, $ 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 |
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| Earnings Per Share [Abstract] | |||||||||||
| Income from continuing operations | $ 1,557 | $ 2,155 | $ 2,469 | $ 2,706 | $ 661 | $ 1,785 | $ 1,796 | $ 1,993 | $ 8,887 | $ 6,235 | $ 6,122 |
| Income (loss) from discontinued operations | 1 | (1) | (2) | (2) | 2 | 6 | (5) | (22) | (4) | (19) | 1 |
| Net income | 1,558 | 2,154 | 2,467 | 2,704 | 663 | 1,791 | 1,791 | 1,971 | 8,883 | 6,216 | 6,123 |
| Net income applicable to noncontrolling interests | 27 | 42 | 30 | 36 | 20 | 10 | 34 | 41 | 135 | 105 | 144 |
| Net income applicable to Morgan Stanley | 1,531 | 2,112 | 2,437 | 2,668 | 643 | 1,781 | 1,757 | 1,930 | 8,748 | 6,111 | 5,979 |
| 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 |
| Basic EPS | |||||||||||
| Weighted average common shares outstanding | 1,708 | 1,780 | 1,849 | ||||||||
| Earnings per basic common share | |||||||||||
| Income from continuing operations | $ 0.81 | $ 1.19 | $ 1.32 | $ 1.48 | $ 0.27 | $ 0.95 | $ 0.89 | $ 1.03 | $ 4.81 | $ 3.15 | $ 2.98 |
| Income (loss) from discontinued operations | 0 | 0 | 0 | 0 | 0 | 0 | 0 | (0.01) | 0 | (0.01) | 0 |
| Earnings per basic common share | 0.81 | 1.19 | 1.32 | 1.48 | 0.27 | 0.95 | 0.89 | 1.02 | $ 4.81 | $ 3.14 | $ 2.98 |
| Diluted EPS | |||||||||||
| Weighted average common shares outstanding | 1,708 | 1,780 | 1,849 | ||||||||
| Effect of dilutive securities: Stock options and RSUs | 30 | 41 | 38 | ||||||||
| Weighted average common shares outstanding and common stock equivalents | 1,738 | 1,821 | 1,887 | ||||||||
| Earnings per diluted common share | |||||||||||
| Income from continuing operations | 0.8 | 1.17 | 1.3 | 1.46 | 0.26 | 0.93 | 0.87 | 1.01 | $ 4.73 | $ 3.08 | $ 2.92 |
| Income (loss) from discontinued operations | 0 | 0 | 0 | (0.01) | 0 | 0 | 0 | (0.01) | 0 | (0.01) | 0 |
| Earnings per diluted common share | $ 0.8 | $ 1.17 | $ 1.3 | $ 1.45 | $ 0.26 | $ 0.93 | $ 0.87 | $ 1 | $ 4.73 | $ 3.07 | $ 2.92 |
| Weighted average antidilutive RSUs and stock options (excluded from the computation of diluted EPS) | 0 | 0 | 1 | 0 | 13 | ||||||
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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- Definition Amount after tax of income (loss) from continuing operations including portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Per basic share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Per diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Portion of net income (loss) attributable to nonredeemable noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- References No definition available.
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- References No definition available.
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- Definition The amount of preferred stock dividends that is an adjustment to net income apportioned to common stockholders. No definition available.
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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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