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Investment Securities (Tables)
 12 Months Ended
Mar. 31, 2024
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost, Gross Unrealized Gains (Losses) and Fair Value of Investment Securities
The following tables present the amortized cost, gross unrealized gains and losses, and fair value of Available-for-sale debt securities and Held-to-maturity debt securities at March 31, 2023 and 2024:
At March 31, 2023:
Amortized
 cost
 
Gross
 unrealized
 gains
 
Gross
 unrealized
 losses
 Fair value
 (in millions)
Available-for-sale debt securities:       
Japanese national government and Japanese government agency bonds¥26,153,862 ¥16,510 ¥123,769 ¥26,046,603 
Japanese prefectural and municipal bonds2,773,750 2,063 15,872 2,759,941 
Foreign government and official institution bonds3,029,042 2,072 108,372 2,922,742 
Corporate bonds1,051,347 9,791 2,977 1,058,161 
Residential mortgage-backed securities1,110,126 569 441 1,110,254 
Asset-backed securities1,418,563 16,116 4,364 1,430,315 
Other debt securities417,755 1,873 6,842 412,786 
Total¥35,954,445 ¥48,994 ¥262,637 ¥35,740,802 
Held-to-maturity debt securities:
Japanese national government and Japanese government agency bonds¥13,860,457 ¥32,927 ¥19,789 ¥13,873,595 
Japanese prefectural and municipal bonds1,144,825 2,473 7,808 1,139,490 
Corporate bonds46,730 213 3 46,940 
Residential mortgage-backed securities3,913,346 13,606 105,754 3,821,198 
Asset-backed securities2,554,723 19 49,809 2,504,933 
Total¥21,520,081 ¥49,238 ¥183,163 ¥21,386,156 

At March 31, 2024:
Amortized
 cost
 
Gross
 unrealized
 gains
 
Gross
 unrealized
 losses
 Fair value
 (in millions)
Available-for-sale debt securities:       
Japanese national government and Japanese government agency bonds¥23,287,730 ¥5,768 ¥126,098 ¥23,167,400 
Japanese prefectural and municipal bonds1,055,564 227 9,800 1,045,991 
Foreign government and official institution bonds3,407,036 4,653 132,406 3,279,283 
Corporate bonds1,015,312 10,550 4,271 1,021,591 
Residential mortgage-backed securities1,229,615 255 345 1,229,525 
Asset-backed securities1,239,772 9,251 1,877 1,247,146 
Other debt securities408,467 3,419 7,450 404,436 
Total¥31,643,496 ¥34,123 ¥282,247 ¥31,395,372 
Held-to-maturity debt securities:
Japanese national government and Japanese government agency bonds¥15,191,741 ¥4,745 ¥97,603 ¥15,098,883 
Japanese prefectural and municipal bonds1,999,182 2,048 16,328 1,984,902 
Corporate bonds119,490 93 179 119,404 
Residential mortgage-backed securities4,952,083 3,153 179,537 4,775,699 
Asset-backed securities2,581,466 3,681 6,521 2,578,626 
Total¥24,843,962 ¥13,720 ¥300,168 ¥24,557,514 
Amortized Cost and Fair Value by Contractual Maturity Debt securities not due at a single maturity date and securities embedded with call or prepayment options, such as mortgage-backed securities, are included in the table below based on their contractual maturities.
 
Held-to-maturity debt
 securities
 
Available-for-sale
 debt securities
 
Amortized
 cost
 Fair value Fair value
 (in millions)
Due in one year or less¥3,540,173 ¥3,541,664 ¥21,034,934 
Due from one year to five years8,493,590 8,461,176 5,841,097 
Due from five years to ten years6,917,839 6,838,185 1,682,434 
Due after ten years5,892,360 5,716,489 2,836,907 
Total¥24,843,962 ¥24,557,514 ¥31,395,372 
Investments by Length and Category in Continuous Loss Position
The following tables show the gross unrealized losses and fair value of Available-for-sale debt securities at March 31, 2023 and 2024 by length of time that individual securities in each category have been in a continuous loss position:
 Less than 12 months 12 months or more Total
At March 31, 2023:Fair value 
Gross
 unrealized
 losses
 Fair value 
Gross
 unrealized
 losses
 Fair value 
Gross
 unrealized
 losses
 Number of securities
 (in millions, except number of securities)
Available-for-sale debt securities:             
Japanese national government and Japanese government agency bonds¥7,644,337 ¥8,066 ¥2,105,210 ¥115,703 ¥9,749,547 ¥123,769 438
Japanese prefectural and municipal bonds962,234 1,781 711,896 14,091 1,674,130 15,872 723
Foreign government and official institution bonds858,970 18,677 1,436,798 89,695 2,295,768 108,372 118
Corporate bonds331,411 1,800 249,088 1,177 580,499 2,977 256
Residential mortgage-backed securities166,778 5 522,774 436 689,552 441 15
Asset-backed securities310,388 4,170 39,806 194 350,194 4,364 32
Other debt securities48,804 1,266 47,886 5,576 96,690 6,842 28
Total¥10,322,922 ¥35,765 ¥5,113,458 ¥226,872 ¥15,436,380 ¥262,637 1,610
 Less than 12 months 12 months or more Total
At March 31, 2024:Fair value 
Gross
 unrealized
 losses
 Fair value 
Gross
 unrealized
 losses
 Fair value 
Gross
 unrealized
 losses
 Number of securities
 (in millions, except number of securities)
Available-for-sale debt securities:             
Japanese national government and Japanese government agency bonds¥18,640,364 ¥9,427 ¥1,756,792 ¥116,671 ¥20,397,156 ¥126,098 440
Japanese prefectural and municipal bonds416,047 1,502 520,133 8,298 936,180 9,800 574
Foreign government and official institution bonds402,021 9,723 1,895,194 122,683 2,297,215 132,406 97
Corporate bonds178,960 535 439,771 3,736 618,731 4,271 324
Residential mortgage-backed securities185,197 14 343,621 331 528,818 345 14
Asset-backed securities23,810 9 160,109 1,868 183,919 1,877 17
Other debt securities202,787 54 64,908 7,396 267,695 7,450 56
Total¥20,049,186 ¥21,264 ¥5,180,528 ¥260,983 ¥25,229,714 ¥282,247 1,522
Net Realized Gains (Losses) on Sales of Equity Securities and Net Unrealized Gains (Losses) on Equity Securities Still Held at the Reporting Date
The following table presents net realized gains (losses) on sales of equity securities, and net unrealized gains (losses) on equity securities still held at March 31, 2022, 2023 and 2024:
 
Fiscal years ended
 March 31,
 202220232024
 (in millions)
Net gains (losses) recognized during the period(1)
¥(125,271)¥104,023 ¥1,527,173 
Less:
Net gains (losses) recognized during the period on equity securities sold during the period(38,042)18,313 114,436 
Net unrealized gains (losses) recognized during the reporting period still held at the reporting date¥(87,229)¥85,710 ¥1,412,737 
Note:
(1)Included in Investment securities gains (losses)—net.
Carrying Value of Nonmarketable Equity Securities
The following table presents the carrying value of nonmarketable equity securities that are measured at cost minus impairment, if any, plus or minus changes resulting from observable price changes (“measurement alternative”), held at March 31, 2023 and 2024:
 20232024
 (in millions)
Measurement alternative balance¥381,928 ¥483,213 
Related Adjustments for Nonmarketable Equity Securities
The related adjustments for these securities for the fiscal years ended March 31, 2022, 2023 and 2024 were as follows:
 
Fiscal years ended
 March 31,
 202220232024
 
(in millions)
Measurement alternative impairment losses(1)(4)
¥(4,299)¥(8,230)¥(11,943)
Measurement alternative downward changes for observable prices(1)(2)(3)(5)
¥— ¥(440)¥(1,567)
Measurement alternative upward changes for observable prices(1)(2)(3)(6)
¥3,067 ¥5,090 ¥882 
Notes:
(1)Included in Investment securities gains (losses)—net.
(2)Under the measurement alternative, nonmarketable equity securities are carried at cost plus or minus changes resulting from observable prices in orderly transactions for the identical or a similar investment of the same issuer.
(3)The MUFG Group applied measurement alternative downward or upward changes to certain nonmarketable equity securities, resulting from observable prices in orderly transactions, such as partial repurchase and transactions by other entities.
(4)The cumulative impairment losses at March 31, 2023 and 2024 were ¥20,151 million and ¥29,569 million, respectively.
(5)The cumulative downward changes for observable prices at March 31, 2023 and 2024 were ¥1,393 million and ¥2,961 million, respectively.
(6)The cumulative upward changes for observable prices at March 31, 2023 and 2024 were ¥59,069 million and ¥58,104 million, respectively.