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Total Equity (Narrative) (Details) (USD $)
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6 Months Ended | 0 Months Ended | 6 Months Ended | ||||
|---|---|---|---|---|---|---|---|
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Jun. 30, 2011
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Jun. 30, 2010
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Dec. 31, 2010
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Apr. 21, 2011
MUFG Stock Conversion [Member]
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Jun. 30, 2011
MUFG Stock Conversion [Member]
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Jun. 30, 2011
Mitsubishi UFJ Morgan Stanley Securities Co., Ltd [Member]
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Jun. 30, 2010
Mitsubishi UFJ Morgan Stanley Securities Co., Ltd [Member]
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| Remaining amount under its current share repurchase authorization | $ 1,600,000,000 | ||||||
| Face value of stock converted | 7,800,000,000 | 7,800,000,000 | |||||
| Carrying value of stock converted | 8,100,000,000 | ||||||
| Common stock dividend rate | 10.00% | ||||||
| Common stock, shares outstanding | 1,929,032,583 | 1,512,022,095 | 385,464,097 | ||||
| Preferred stock, stock dividends | 75,000,000 | ||||||
| Value of stock converted adjustments | 1,700,000,000 | 1,700,000,000 | |||||
| Increase in paid-in capital | 717,000,000 | 717,000,000 | |||||
| Gain on sale of equity method investments | $ 717,000,000 | ||||||