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Marketable securities and securities investments (Tables)
 12 Months Ended
Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Aggregate Cost, Gross Unrealized Gains and Losses and Fair Value Pertaining to Available-for-Sale Securities and Held-to-Maturity Securities
Marketable securities and securities investments, primarily held in the Financial Services segment, include debt securities for which the aggregate cost, gross unrealized gains and losses and fair value pertaining to
available-for-sale
securities and
held-to-maturity
securities are as follow
s
.
                                                                 
 
Yen in millions
 
 
March 31, 2019
 
 
March 31, 2020
 
 
Cost
 
 
Gross
unrealized
gains
 
 
Gross
unrealized
losses
 
 
Fair value
 
 
Cost
 
 
Gross
unrealized
gains
 
 
Gross
unrealized
losses
 
 
Fair value
 
Debt securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Available-for-sale securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Japanese national government bonds
 
 
1,422,620
 
 
 
220,989
 
 
 
(20
)
 
 
1,643,589
 
 
 
1,552,036
 
 
 
210,459
 
 
 
(566
)
 
 
1,761,929
 
Japanese local government bonds
 
 
67,461
 
 
 
70
 
 
 
(34
)
 
 
67,497
 
 
 
69,132
 
 
 
73
 
 
 
(33
)
 
 
69,172
 
Japanese corporate bonds
 
 
202,433
 
 
 
17,178
 
 
 
(223
)
 
 
219,388
 
 
 
202,164
 
 
 
19,112
 
 
 
(567
)
 
 
220,709
 
Foreign government bonds
 
 
153,429
 
 
 
8,669
 
 
 
(603
)
 
 
161,495
 
 
 
198,777
 
 
 
81,014
 
 
 
(14
)
 
 
279,777
 
Foreign corporate bonds
 
 
360,299
 
 
 
944
 
 
 
(376
)
 
 
360,867
 
 
 
361,422
 
 
 
507
 
 
 
(2,179
)
 
 
359,750
 
Securitized products
 
 
190,111
 
 
 
1
 
 
 
—
 
 
 
190,112
 
 
 
205,223
 
 
 
0
 
 
 
—
 
 
 
205,223
 
Other
 
 
2,286
 
 
 
2,402
 
 
 
—
 
 
 
4,688
 
 
 
14,398
 
 
 
1,867
 
 
 
(12
)
 
 
16,253
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2,398,639
 
 
 
250,253
 
 
 
(1,256
)
 
 
2,647,636
 
 
 
2,603,152
 
 
 
313,032
 
 
 
(3,371
)
 
 
2,912,813
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Held-to-maturity
securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Japanese national government bonds
 
 
6,042,635
 
 
 
2,016,786
 
 
 
—
 
 
 
8,059,421
 
 
 
6,204,505
 
 
 
2,098,885
 
 
 
(1,397
)
 
 
8,301,993
 
Japanese local government bonds
 
 
3,518
 
 
 
388
 
 
 
—
 
 
 
3,906
 
 
 
2,504
 
 
 
331
 
 
 
—
 
 
 
2,835
 
Japanese corporate bonds
 
 
409,329
 
 
 
44,348
 
 
 
(5,845
)
 
 
447,832
 
 
 
482,050
 
 
 
61,176
 
 
 
(4,754
)
 
 
538,472
 
Foreign government bonds
 
 
386,392
 
 
 
18,609
 
 
 
(13,742
)
 
 
391,259
 
 
 
723,937
 
 
 
302,297
 
 
 
—
 
 
 
1,026,234
 
Foreign corporate bonds
 
 
198
 
 
 
11
 
 
 
—
 
 
 
209
 
 
 
98
 
 
 
7
 
 
 
—
 
 
 
105
 
Securitized products
 
 
—
 
 
 
—
 
 
 
—
 
 
 
—
 
 
 
5,418
 
 
 
—
 
 
 
(421
)
 
 
4,997
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
6,842,072
 
 
 
2,080,142
 
 
 
(19,587
)
 
 
8,902,627
 
 
 
7,418,512
 
 
 
2,462,696
 
 
 
(6,572
)
 
 
9,874,636
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total
 
 
9,240,711
 
 
 
2,330,395
 
 
 
(20,843
)
 
 
11,550,263
 
 
 
10,021,664
 
 
 
2,775,728
 
 
 
(9,943
)
 
 
12,787,449
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cost and Fair Value of Debt Securities Classified as Available-for-Sale Securities and Held-to-Maturity Securities by Contractual Maturity
The following table presents the cost and fair value of debt securities classified as
available-for-sale
securities and
held-to-maturity
securities by contractual maturity:
                                 
 
Yen in millions
 
 
March 31, 2020
 
 
Available-for-sale
securities
   
Held-to-maturity
securities
 
 
Cost
 
  
Fair value
 
  
Cost
 
  
Fair value
 
Due in one year or less
   
145,867
     
146,084
     
6,075
     
6,109
 
Due after one year through five years
   
432,281
     
435,443
     
199,509
     
217,983
 
Due after five years through ten years
   
561,098
     
637,363
     
246,072
     
283,086
 
Due after ten years
   
1,463,906
     
1,693,923
     
6,966,856
     
9,367,458
 
   
 
 
    
 
 
    
 
 
    
 
 
  
Total
   
2,603,152
     
2,912,813
     
7,418,512
     
9,874,636
 
                                 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Gross Unrealized Losses and Fair Value of Securities with Unrealized Losses, Aggregated by Investment Category and Length of Time in Continuous Unrealized Loss Position
The following tables present the gross unrealized losses on, and fair value of, Sony’s investment securities with unrealized losses, aggregated by investment category and the length of time that individual investment securities have been in a continuous unrealized loss position, at March 31, 2019 and 2020.
                                                 
 
Yen in millions
 
 
March 31, 2019
 
 
Less than 12 months
   
12 months or more
   
Total
 
 
Fair
value
 
  
Unrealized
losses
 
  
Fair
value
 
  
Unrealized
losses
 
  
Fair
value
 
  
Unrealized
losses
 
Debt securities:
   
     
     
     
     
     
 
Available-for-sale securities:
   
     
     
     
     
     
 
Japanese national government bonds
   
—
     
—
     
4,063
     
(20
 )    
4,063
     
(20
 )
Japanese local government bonds
   
27,404
     
(29
 )    
4,872
     
(5
 )    
32,276
     
(34
 )
Japanese corporate bonds
   
25,725
     
(21
 )    
19,925
     
(202
 )    
45,650
     
(223
 )
Foreign government bonds
   
—
     
—
     
15,878
     
(603
 )    
15,878
     
(603
 )
Foreign corporate bonds
   
50,281
     
(117
 )    
15,455
     
(259
 )    
65,736
     
(376
 )
Securitized products
   
—
     
—
     
—
     
—
     
—
     
—
 
Other
   
—
     
—
     
—
     
—
     
—
     
—
 
   
 
 
    
 
 
    
 
 
    
 
 
    
 
 
    
 
 
  
   
103,410
     
(167
 )    
60,193
     
(1,089
 )    
163,603
     
(1,256
 )
   
 
 
    
 
 
    
 
 
    
 
 
    
 
 
    
 
 
  
Held-to-maturity
securities:
    
     
     
     
     
     
 
Japanese national government bonds
   
—
     
—
     
—
     
—
     
—
     
—
 
Japanese local government bonds
   
—
     
—
     
—
     
—
     
—
     
—
 
Japanese corporate bonds
   
—
     
—
     
97,984
     
(5,845
 )    
97,984
     
(5,845
 )
Foreign government bonds
   
—
     
—
     
151,229
     
(13,742
 )    
151,229
     
(13,742
 )
Foreign corporate bonds
   
—
     
—
     
—
     
—
     
—
     
—
 
   
 
 
    
 
 
    
 
 
    
 
 
    
 
 
    
 
 
  
   
—
     
—
     
249,213
     
(19,587
 )    
249,213
     
(19,587
 )
   
 
 
    
 
 
    
 
 
    
 
 
    
 
 
    
 
 
  
Total
   
103,410
     
(167
 )    
309,406
     
(20,676
 )    
412,816
     
(20,843
 )
                                                 
 
 
 
 
 
                                                 
 
Yen in millions
 
 
March 31, 2020
 
 
Less than 12 months
   
12 months or more
   
Total
 
 
Fair
value
 
  
Unrealized
losses
 
  
Fair
value
 
  
Unrealized
losses
 
  
Fair
value
 
  
Unrealized
losses
 
Debt securities:
   
     
     
     
     
     
 
Available-for-sale securities:
   
     
     
     
     
     
 
Japanese national government bonds
   
51,746
     
(539
 )    
2,032
     
(27
 )    
53,778
     
(566
 )
Japanese local government bonds
   
25,010
     
(10
 )    
16,340
     
(23
 )    
41,350
     
(33
 )
Japanese corporate bonds
   
62,118
     
(548
 )    
10,694
     
(19
 )    
72,812
     
(567
 )
Foreign government bonds
   
—
     
—
     
1,537
     
(14
 )    
1,537
     
(14
 )
Foreign corporate bonds
   
86,220
     
(2,133
 )    
18,896
     
(46
 )    
105,116
     
(2,179
 )
Securitized products
   
—
     
—
     
—
     
—
     
—
     
—
 
Other
   
12,055
 
 
 
(12
)
 
 
—
 
 
 
—
 
 
 
12,055
      
(12
)
 
   
 
 
    
 
 
    
 
 
    
 
 
    
 
 
    
 
 
  
   
237,149
     
(3,242
 )    
49,499
     
(129
 )    
286,648
     
(3,371
 )
   
 
 
    
 
 
    
 
 
    
 
 
    
 
 
    
 
 
  
Held-to-maturity
securities:
    
     
     
     
     
     
 
Japanese national government bonds
   
134,320
     
(1,397
 )    
—
     
—
     
134,320
     
(1,397
 )
Japanese local government bonds
   
—
     
—
     
—
     
—
     
—
     
—
 
Japanese corporate bonds
   
98,172
     
(4,285
 )    
3,727
     
(469
 )    
101,899
     
(4,754
 )
Foreign government bonds
   
—
     
—
     
—
     
—
     
—
     
—
 
Foreign corporate bonds
   
—
     
—
     
—
     
—
     
—
     
—
 
Securitized products
   
5,418
      
(421
 )    
—
      
—
      
5,418
      
(421
 )
   
 
 
    
 
 
    
 
 
    
 
 
    
 
 
    
 
 
  
   
237,910
     
(6,103
 )    
3,727
     
(469
 )    
241,637
     
(6,572
 )
   
 
 
    
 
 
    
 
 
    
 
 
    
 
 
    
 
 
  
Total
   
475,059
     
(9,345
 )    
53,226
     
(598
 )    
528,285
     
(9,943
 )