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Variable Interest Entities and Securitizations (Carrying Amounts and Classification of Assets and Liabilities on Consolidated Balance Sheets that Relate to Variable Interests in Significant Unconsolidated VIEs) (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Assets on balance sheets related to unconsolidated VIEs:      
Trading account assets ¥ 28,092,871 ¥ 21,018,230  
Loans 87,087,233 82,492,742  
Total assets 211,218,760 197,611,195 ¥ 204,255,600
Liabilities on balance sheets and maximum exposure to loss related to unconsolidated VIEs:      
Payables under securities lending transactions 1,423,638 1,797,737  
Trading account liabilities 12,416,785 10,120,968  
Total 202,043,136 188,109,702  
Maximum exposure to loss 521,000 418,000  
Unconsolidated VIEs      
Assets on balance sheets related to unconsolidated VIEs:      
Trading account assets 108,000 104,000  
Investments 267,000 168,000  
Loans 55,000 71,000  
Total assets 430,000 343,000  
Liabilities on balance sheets and maximum exposure to loss related to unconsolidated VIEs:      
Payables under securities lending transactions 47,000 47,000  
Trading account liabilities 2,000 1,000  
Total 49,000 48,000  
Maximum exposure to loss [1] ¥ 521,000 ¥ 418,000  
[1] This represents the maximum amount the Group could possibly be required to record in its consolidated statements of income associated with on-balance-sheet exposures and off-balance-sheet liabilities such as undrawn commitments.