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SUMMARY OF ACCOUNTING POLICIES - Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Nov. 19, 2024
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Components of acquired intangible assets        
Intangible assets residual value   $ 0    
Finite-lived intangible assets   165    
Gross carrying amount   748 $ 614  
Accumulated Amortization   (405) (369)  
Total amortization expense   343 245  
Intangible amortization   70 70 $ 81
Intangible assets fully amortized and removed   31    
Estimated future annual amortization expense for acquired intangible assets        
2026   67    
2027   57    
2028   43    
2029   40    
2030   35    
Thereafter   101    
Total amortization expense   343 245  
Crown        
Components of acquired intangible assets        
Finite-lived intangible assets $ 128      
Customer-related intangibles        
Components of acquired intangible assets        
Finite-lived intangible assets   $ 100    
Intangible assets, weighted average useful life   8 years 3 months 18 days    
Gross carrying amount   $ 383 316  
Accumulated Amortization   (186) (186)  
Total amortization expense   197 130  
Estimated future annual amortization expense for acquired intangible assets        
Total amortization expense   $ 197 130  
Customer-related intangibles | Maximum        
Components of acquired intangible assets        
Useful life   10 years    
Licenses and other intangibles        
Components of acquired intangible assets        
Finite-lived intangible assets   $ 65    
Intangible assets, weighted average useful life   6 years 8 months 12 days    
Gross carrying amount   $ 365 298  
Accumulated Amortization   (219) (183)  
Total amortization expense   146 115  
Estimated future annual amortization expense for acquired intangible assets        
Total amortization expense   $ 146 $ 115