Regulatory Capital Requirements (Narrative) (Detail)
¥ in Millions |
12 Months Ended |
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Mar. 31, 2022
JPY (¥)
guideline
Approach
capitalRatio
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Dec. 31, 2021 |
Mar. 31, 2021
JPY (¥)
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Dec. 31, 2020 |
Dec. 31, 2019 |
| Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |
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| Number of methodologies/guidelines | guideline |
2
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| Number of regulatory capital ratios | capitalRatio |
3
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| Basel III |
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| Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |
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| Number of approaches | Approach |
3
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| Risk weighted threshold of items not deducted from Common Equity Tier 1 capital |
250.00%
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| FSA's requirements applicable to Japanese banking institutions |
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| Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |
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| Minimum Common Equity Tier 1 capital ratio |
0.0450
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0.0450
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| Capital conservation buffer |
2.50%
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2.50%
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| G-SIB surcharge |
1.50%
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1.50%
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| Countercyclical buffer |
0.01%
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0.00%
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| Tier 1 leverage ratio |
0.03
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| Percentage of G-SIB leverage ratio buffer to G-SIB capital surcharge, effective on January 1, 2022 |
50.00%
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| Basel III for Security Companies in Japan |
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| Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |
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| Minimum capital ratio required for financial Instruments firms to maintain by Financial Instruments and Exchange Act and related ordinance |
120.00%
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| Minimum capital ratio requirement for financial instruments firms which will call for regulatory reporting |
140.00%
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| Minimum capital ratio requirement for financial instrument firms which may lead to a suspension of all or part of the business for a period of time and cancellation of a registration |
100.00%
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| Basel III for Security Companies in Japan | Stand-alone, Mitsubishi UFJ Morgan Stanley Securities |
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| Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |
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| Amount of capital accounts less certain fixed assets | ¥ |
¥ 486,756
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¥ 475,343
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| Percentage of capital accounts to the total amounts equivalent to market, counterparty credit and operational risks |
317.10%
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275.40%
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| U.S. Basel III |
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| Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |
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| Minimum Common Equity Tier 1 capital ratio |
0.045
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| Capital conservation buffer |
2.50%
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| Countercyclical buffer |
2.50%
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| Tier 1 leverage ratio |
0.04
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| Total minimum Common Equity Tier 1 capital ratio |
7.00%
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| Tier 1 supplementary leverage ratio |
0.03
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| Phase-in period to eliminate the accumulated OCI or loss exclusion applied under Basel I and Basel II rules |
4 years
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| Capital conservation buffer phase-in arrangements |
0.625%
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| Phase-in period for full implementation of capital conservation buffer |
4 years
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| U.S. Basel III | BK (US) |
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| Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |
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| Minimum total risk-based capital ratio to be categorized as "well capitalized" |
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0.10
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0.10
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| Tier 1 risk-based capital ratio to be categorized as "well capitalized" |
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0.08
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0.08
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| Tier 1 capital to quarterly average assets to be categorized as "well capitalized" |
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0.05
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0.05
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| Common Equity Tier 1 risk-based capital ratio to be categorized as "well capitalized" |
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0.065
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0.065
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