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Related Party Transactions (Details) - USD ($)
 1 Months Ended 3 Months Ended
Feb. 28, 2023
Jun. 30, 2025
Jun. 30, 2024
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2022
Related Party Transaction [Line Items]            
Revenue   $ 1,053,000,000 $ 939,000,000      
Operating expenses   909,000,000 724,000,000      
Accounts receivable, net   1,315,000,000   $ 1,107,000,000    
Other current liabilities (including payables to related parties of $10 and $11 as of June 30, 2025 and March 31, 2025, respectively)   512,000,000   426,000,000    
Contract liabilities   259,000,000   209,000,000    
Additional (reversal of) provision   (1,000,000) 16,000,000      
Allowance for current expected credit losses   (19,000,000) (19,000,000) (20,000,000) $ (3,000,000)  
Proceeds from equity method investments   1,800,000 300,000      
Prepaid expenses and other current assets   307,000,000   256,000,000    
Other non-current assets   245,000,000   305,000,000    
Loans receivable            
Related Party Transaction [Line Items]            
Loans and other receivables carried at amortized cost   27,000,000   27,000,000    
Cerfe Labs, Inc. | Loans receivable            
Related Party Transaction [Line Items]            
Loans and other receivables carried at amortized cost   3,200,000   3,200,000    
Ampere | Loans receivable            
Related Party Transaction [Line Items]            
Other non-current assets   34,200,000   33,800,000    
Related Parties            
Related Party Transaction [Line Items]            
Revenue   328,000,000 124,000,000      
Operating lease, lease income, lease payments   200,000 400,000      
Accounts receivable, net   401,000,000   279,000,000    
Other current liabilities (including payables to related parties of $10 and $11 as of June 30, 2025 and March 31, 2025, respectively)   10,000,000   11,000,000    
Contract liabilities   104,000,000   105,000,000    
Related Parties | Arduino | Loans receivable            
Related Party Transaction [Line Items]            
Other non-current assets   16,800,000   16,600,000    
Service Share Arrangement | Related Parties            
Related Party Transaction [Line Items]            
Revenue   201,000,000 122,600,000      
Operating expenses   13,900,000 16,200,000      
Net receivable   355,900,000   284,600,000    
Accounts receivable, net   365,600,000   294,500,000    
Other current liabilities (including payables to related parties of $10 and $11 as of June 30, 2025 and March 31, 2025, respectively)   9,700,000   9,900,000    
Contract liabilities   103,400,000   104,200,000    
Additional (reversal of) provision   0 (16,000,000)      
Allowance for current expected credit losses   (16,000,000)   (16,000,000)    
Common Control in SoftBank | Related Parties            
Related Party Transaction [Line Items]            
Revenue   126,100,000 0      
Accounts receivable, net   45,000,000   0    
Contract liabilities   0   0    
Contract assets   226,600,000   145,500,000    
Other Equity Investments | Related Parties            
Related Party Transaction [Line Items]            
Revenue   600,000 1,400,000      
Accounts receivable, net   6,000,000   700,000    
Contract liabilities   500,000   700,000    
Contract assets   500,000   6,300,000    
Linaro Agreement | Related Parties            
Related Party Transaction [Line Items]            
Other current liabilities (including payables to related parties of $10 and $11 as of June 30, 2025 and March 31, 2025, respectively)   300,000   700,000    
Subscription costs incurred   2,300,000 $ 2,400,000      
Amounts of transaction $ 4,000,000          
Related party transaction, term 5 years          
Prepaid expenses and other current assets   $ 2,400,000   $ 2,400,000    
Acetone Limited            
Related Party Transaction [Line Items]            
Ownership percentage           10.00%
Arm China | Acetone Limited            
Related Party Transaction [Line Items]            
Ownership percentage           48.20%