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Financial Instruments - Additional Information (Details) - USD ($)
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Disclosure Of Financial Instruments [Line Items]        
Description of reasons for transfers out of level 1 in to level 2 of fair value hierarchy assets During fiscal 2024, quoted debt securities of $257 million were transferred from Level 2 to Level 1 of fair value hierarchy, since these were valued based on quoted price and quoted debt securities of $9 million were transferred from Level 1 to Level 2 of fair value hierarchy, since these were valued based on market observable inputs. During fiscal 2023, quoted debt securities of $47 million were transferred from Level 2 to Level 1 of fair value hierarchy, since these were valued based on quoted price and quoted debt securities of $196 million were transferred from Level 1 to Level 2 of fair value hierarchy, since these were valued based on market observable inputs.    
Percentage point change in unobservable inputs used in fair valuation of Level 3 assets and liabilities that does not have significant impact 1.00% 1.00%    
Exchange rate differences, percentage effect on incremental operating margins 0.43% 0.44% 0.46%  
Derivative maturity description 12 months 12 months    
Impairment loss under expected credit loss on customer balances $ 11,000,000 $ 28,000,000 $ 19,000,000  
Days Sales Outstanding- DSO 71 days 62 days    
Outstanding bank borrowings $ 0      
Working capital 6,071,000,000 $ 3,857,000,000    
Cash and cash equivalents 1,773,000,000 1,481,000,000 2,305,000,000 $ 3,380,000,000
Current investments 1,548,000,000 841,000,000    
Outstanding employee benefit obligations 325,000,000 302,000,000    
Liquidity risk on account of outstanding employee benefit obligations 0 0    
Quoted Debt Securities        
Disclosure Of Financial Instruments [Line Items]        
Debt securities, transferred from Level 1 to Level 2 of fair value hierarchy 9,000,000 196,000,000    
Debt securities, transferred from Level 2 to Level 1 of fair value hierarchy 257,000,000 47,000,000    
Derivatives Not Designated As Cash Flow Hedges        
Disclosure Of Financial Instruments [Line Items]        
Net gain (loss) recognized on derivative financial instruments 22,000,000 (69,000,000) $ 22,000,000  
Trade Receivables        
Disclosure Of Financial Instruments [Line Items]        
Maximum exposure to credit risk 3,620,000,000 3,094,000,000    
Unbilled Revenue        
Disclosure Of Financial Instruments [Line Items]        
Maximum exposure to credit risk $ 1,744,000,000 $ 2,037,000,000