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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Income Tax Contingency [Line Items]        
Tax benefit, intra-entity transfers of assets other than inventory, amount     $ 44 $ 147
Effective income tax rate reconciliation, foreign income tax rate differential, expense (benefit)     (58)  
Tax expense (benefit), share-based payment arrangement     (41)  
Unrecognized tax benefits, increase (decrease)     (47)  
Tax contingency, interest expense, amount     56  
Effective income tax rate reconciliation, net discrete tax benefit   $ 141   $ 141
Unrecognized tax benefits $ 1,400   1,400  
Unrecognized tax benefits that would impact effective tax rate 1,300   1,300  
Disposed of by sale | Canadian retail disposal group        
Income Tax Contingency [Line Items]        
Canadian businesses held for sale $ 23   $ 666