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Pension and Severance Plans (Summary of Changes in Fair Values of Japanese and Foreign Plans' Level Three Assets) (Detail) - JPY (¥)
¥ in Millions
 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Japan    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of the fiscal year ¥ 742,204 ¥ 711,077
Fair value of plan assets at end of the fiscal year 437,206 742,204
Japan | Private equity    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of the fiscal year [1] 27,956  
Fair value of plan assets at end of the fiscal year [1] 30,191 27,956
Japan | Hedge funds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of the fiscal year [2] 71,606  
Fair value of plan assets at end of the fiscal year [2] 48,410 71,606
Japan | Corporate bonds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of the fiscal year [3] 97,519  
Fair value of plan assets at end of the fiscal year [3] 71,192 97,519
Japan | Real estate and other    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of the fiscal year [4] 21,392  
Fair value of plan assets at end of the fiscal year [4] 22,785 21,392
Foreign plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of the fiscal year 274,749 269,745
Fair value of plan assets at end of the fiscal year 281,110 274,749
Foreign plans | Corporate bonds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of the fiscal year [5] 32,749  
Fair value of plan assets at end of the fiscal year [5] 31,769 32,749
Foreign plans | Real estate and other    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of the fiscal year [4] 33,207  
Fair value of plan assets at end of the fiscal year [4] 33,569 33,207
Foreign plans | Insurance contracts    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of the fiscal year [6] 18,308  
Fair value of plan assets at end of the fiscal year [6] 19,334 18,308
Level 3 | Japan    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of the fiscal year 120,954 113,779
Return on assets held at end of year 2,419 6,709
Purchases, sales, and settlements, net (19,401) 466
Fair value of plan assets at end of the fiscal year 103,972 120,954
Level 3 | Japan | Private equity    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of the fiscal year 27,956 [1] 24,144
Return on assets held at end of year 2,649 4,428
Purchases, sales, and settlements, net (414) (616)
Fair value of plan assets at end of the fiscal year [1] 30,191 27,956
Level 3 | Japan | Hedge funds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of the fiscal year 71,606 [2] 70,204
Return on assets held at end of year (648) 659
Purchases, sales, and settlements, net (22,548) 743
Fair value of plan assets at end of the fiscal year [2] 48,410 71,606
Level 3 | Japan | Real estate and other    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of the fiscal year 21,392 [4] 19,431
Return on assets held at end of year 418 1,622
Purchases, sales, and settlements, net 3,561 339
Fair value of plan assets at end of the fiscal year [4] 25,371 21,392
Level 3 | Foreign plans    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of the fiscal year 34,583 44,008
Return on assets held at end of year 691 1,295
Purchases, sales, and settlements, net 382 (4,198)
Transfers, net   (5,417)
Other [7] (1,181) (1,105)
Fair value of plan assets at end of the fiscal year 34,475 34,583
Level 3 | Foreign plans | Corporate bonds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of the fiscal year   5,303
Transfers, net   (5,540)
Other [7]   237
Level 3 | Foreign plans | Real estate and other    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of the fiscal year 22,089 [4] 25,976
Return on assets held at end of year 132 559
Purchases, sales, and settlements, net 755 (3,809)
Transfers, net   123
Other [7] (679) (760)
Fair value of plan assets at end of the fiscal year [4] 22,297 22,089
Level 3 | Foreign plans | Insurance contracts    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of the fiscal year 12,494 [6] 12,729
Return on assets held at end of year 559 736
Purchases, sales, and settlements, net (373) (389)
Other [7] (502) (582)
Fair value of plan assets at end of the fiscal year [6] ¥ 12,178 ¥ 12,494
[1] Includes multiple private equity funds of funds that primarily invest in venture, buyout, and distressed markets in the United States and Europe.
[2] Includes primarily funds that invest in a portfolio of a broad range of hedge funds to diversify the risks and reduce the volatilities associated with a single hedge fund.
[3] Includes debt securities issued by Japanese and foreign corporation and government related agencies.
[4] Includes primarily private real estate investment trusts.
[5] Includes primarily foreign corporate debt securities.
[6] Represents annuity contracts with or without profit sharing.
[7] Primarily consists of translation adjustments.