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Accumulated Other Comprehensive Income (Loss) (Changes in Components of Accumulated Other Comprehensive Income (Loss)) (Detail) - JPY (¥)
¥ in Millions
 3 Months Ended 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Beginning Balance ¥ 3,722,041 ¥ 3,523,175 ¥ 3,614,322 ¥ 3,414,178
Total other comprehensive income (loss) 75,139 98,522 175,943 218,869
Ending Balance 3,841,996 3,653,898 3,841,996 3,653,898
Net unrealized gains (losses) on investment in securities        
Beginning Balance (184,174) (154,265) (183,034) (72,892)
Net unrealized gains (losses) (98,165) (62,396) (96,984) (142,995)
Reclassification adjustment included in net income, net of tax (1,097) (98) (3,428) (872)
Total other comprehensive income (loss) (99,262) (62,494) (100,412) (143,867)
Transaction with noncontrolling interests     0  
Less: Other Comprehensive Income (loss) Attributable to the Noncontrolling Interests 0 0 0 0
Less: Other Comprehensive Income (loss) Attributable to the Redeemable Noncontrolling Interests 9 0 (1) 0
Ending Balance (283,445) (216,759) (283,445) (216,759)
Impact of changes in policy liability discount rate        
Beginning Balance 169,035 114,386 164,516 37,535
Net unrealized gains (losses) 106,057 82,515 110,576 159,366
Total other comprehensive income (loss) 106,057 82,515 110,576 159,366
Transaction with noncontrolling interests     0  
Less: Other Comprehensive Income (loss) Attributable to the Noncontrolling Interests 0 0 0 0
Less: Other Comprehensive Income (loss) Attributable to the Redeemable Noncontrolling Interests 0 0 0 0
Ending Balance 275,092 196,901 275,092 196,901
Debt valuation adjustments        
Beginning Balance 231 205 275 221
Net unrealized gains (losses) (75) 80 (114) 66
Reclassification adjustment included in net income, net of tax (4) (4) (9) (6)
Total other comprehensive income (loss) (79) 76 (123) 60
Transaction with noncontrolling interests     0  
Less: Other Comprehensive Income (loss) Attributable to the Noncontrolling Interests 0 0 0 0
Less: Other Comprehensive Income (loss) Attributable to the Redeemable Noncontrolling Interests 0 0 0 0
Ending Balance 152 281 152 281
Defined benefit pension plans        
Beginning Balance (3,471) (8,239) (3,617) (8,072)
Net unrealized gains (losses) (171) (105) 51 (225)
Reclassification adjustment included in net income, net of tax (65) (46) (140) (91)
Total other comprehensive income (loss) (236) (151) (89) (316)
Transaction with noncontrolling interests     0  
Less: Other Comprehensive Income (loss) Attributable to the Noncontrolling Interests (1) 0 0 2
Less: Other Comprehensive Income (loss) Attributable to the Redeemable Noncontrolling Interests 0 0 0 0
Ending Balance (3,706) (8,390) (3,706) (8,390)
Foreign currency translation adjustments        
Beginning Balance 251,172 169,590 155,912 61,914
Net unrealized gains (losses) 62,008 70,964 158,400 184,993
Reclassification adjustment included in net income, net of tax 2,257 12 5,183 102
Total other comprehensive income (loss) 64,265 70,976 163,583 185,095
Transaction with noncontrolling interests     11  
Less: Other Comprehensive Income (loss) Attributable to the Noncontrolling Interests 1,230 1,481 5,191 7,886
Less: Other Comprehensive Income (loss) Attributable to the Redeemable Noncontrolling Interests 55 50 163 88
Ending Balance 314,152 239,035 314,152 239,035
Net unrealized gains (losses) on derivative instruments        
Beginning Balance 20,124 12,986 22,083 2,788
Net unrealized gains (losses) 3,783 8,763 6,623 17,082
Reclassification adjustment included in net income, net of tax 611 (1,163) (4,215) 1,449
Total other comprehensive income (loss) 4,394 7,600 2,408 18,531
Transaction with noncontrolling interests     (176)  
Less: Other Comprehensive Income (loss) Attributable to the Noncontrolling Interests 63 739 (140) 1,472
Less: Other Comprehensive Income (loss) Attributable to the Redeemable Noncontrolling Interests 0 0 0 0
Ending Balance 24,455 19,847 24,455 19,847
Accumulated other comprehensive income (loss)        
Beginning Balance 252,917 134,664 156,135 21,495
Total other comprehensive income (loss) 75,139 98,522 175,943 218,869
Transaction with noncontrolling interests     (165)  
Less: Other Comprehensive Income (loss) Attributable to the Noncontrolling Interests 1,292 2,220 5,051 9,360
Less: Other Comprehensive Income (loss) Attributable to the Redeemable Noncontrolling Interests 64 50 162 88
Ending Balance ¥ 326,700 ¥ 230,916 ¥ 326,700 ¥ 230,916