v3.26.1
SUMMARY OF ACCOUNTING POLICIES - Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Components of acquired intangible assets      
Intangible assets residual value $ 0    
Finite-lived intangible assets 2    
Gross Carrying Amount 515 $ 748  
Accumulated Amortization (232) (405)  
Total amortization expense 283 343  
Intangible amortization 68 70 $ 70
Intangible assets fully amortized and removed 254    
Estimated future annual amortization expense for acquired intangible assets      
2027 58    
2028 44    
2029 41    
2030 36    
2031 32    
Thereafter 72    
Total amortization expense $ 283 343  
Customer-related intangibles      
Components of acquired intangible assets      
Weighted-Average Remaining Useful life (in Years) 8 years 1 month 6 days    
Gross Carrying Amount $ 317 383  
Accumulated Amortization (156) (186)  
Total amortization expense 161 197  
Estimated future annual amortization expense for acquired intangible assets      
Total amortization expense $ 161 197  
Customer-related intangibles | Maximum      
Components of acquired intangible assets      
Useful life 10 years    
Licenses and other intangibles      
Components of acquired intangible assets      
Weighted-Average Remaining Useful life (in Years) 6 years    
Gross Carrying Amount $ 198 365  
Accumulated Amortization (76) (219)  
Total amortization expense 122 146  
Estimated future annual amortization expense for acquired intangible assets      
Total amortization expense $ 122 $ 146