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Intangible Assets - Summary of Intangible Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Mar. 31, 2025
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value $ 8,035 $ 7,883
Accumulated Amortization 6,524 6,241
Net Carrying Value 1,511 1,642
Software    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 3,764 3,713
Accumulated Amortization 3,279 3,166
Net Carrying Value 485 547
Customer related intangible assets    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 3,980 3,886
Accumulated Amortization 3,091 2,933
Net Carrying Value 889 953
Other intangible assets    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 291 284
Accumulated Amortization 154 142
Net Carrying Value $ 137 $ 142