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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Income Tax Contingency [Line Items]          
Tax expense (benefit), intra-entity transfers of assets other than inventory, amount $ (44)   $ (147)    
Canadian businesses held for sale       $ 638 $ 0
Effective income tax rate reconciliation, foreign income tax rate differential, expense (benefit)       (58)  
Tax expense (benefit), share-based payment arrangement       (38)  
Unrecognized tax benefits, increase (decrease)       (47)  
Tax contingency, interest expense, amount   $ 12   37  
Unrecognized tax benefits 1,400     1,400  
Unrecognized tax benefits that would impact effective tax rate 1,300     1,300  
Held-for-sale | Canadian retail disposal group          
Income Tax Contingency [Line Items]          
Canadian businesses held for sale $ 643     $ 643