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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Income Tax Contingency [Line Items]        
Tax contingency, interest expense, amount $ 12      
Tax expense (benefit), intra-entity transfers of assets other than inventory, amount     $ (147)  
Effective income tax rate reconciliations, tax credit, amount   $ 16    
Tax expense (benefit), share-based payment arrangement       $ (53)
Unrecognized tax benefits 1,400   1,400  
Unrecognized tax benefits that would impact effective tax rate 1,300   1,300  
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