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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Sep. 30, 2024
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Income Tax Contingency [Line Items]                
Net tax benefit on intellectual property repatriation and sales         $ (258) $ (104) $ 0  
Tax expense (benefit), intra-entity transfers of assets other than inventory, amount $ (214) $ (44) $ (43) $ (147)        
Effective income tax rate reconciliation, release of valuation allowance         0 (157) 0  
Discrete tax benefits related to statute of limitation expirations and tax settlements             115  
Tax expense (benefit), share-based payment arrangement         (42) (37) (58)  
Valuation allowance 644   653   644 653    
Unrecognized tax benefits 1,532   1,463   1,532 1,463 1,399 $ 1,523
Unrecognized tax benefits that would Impact income tax expense and the effective tax rate 1,400       1,400      
Income tax expense (benefit), before any tax effect, related to accrued interest and penalties         80 84 $ 31  
Accrued interest and penalties on unrecognized tax benefits 302   $ 222   302 $ 222    
Undistributed earnings of foreign operations 4,000       4,000      
Minimum                
Income Tax Contingency [Line Items]                
Tax liability increase due to proposed adjustment to taxable income 600       600      
Maximum                
Income Tax Contingency [Line Items]                
Tax liability increase due to proposed adjustment to taxable income 700       700      
Federal                
Income Tax Contingency [Line Items]                
Federal, state and foreign net operating loss carryforwards 40       40      
State                
Income Tax Contingency [Line Items]                
Federal, state and foreign net operating loss carryforwards 4,100       4,100      
Capital Loss Carryforward | Foreign Tax Jurisdiction                
Income Tax Contingency [Line Items]                
Federal, state and foreign net operating loss carryforwards $ 1,300       $ 1,300