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Intangible Assets - Summary of Intangible Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Mar. 31, 2024
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value $ 7,883 $ 7,922
Accumulated Amortization 6,241 5,792
Net Carrying Value 1,642 2,130
Software    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 3,713 3,721
Accumulated Amortization 3,166 3,070
Net Carrying Value 547 651
Customer related intangible assets    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 3,886 3,892
Accumulated Amortization 2,933 2,588
Net Carrying Value 953 1,304
Other intangible assets    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 284 309
Accumulated Amortization 142 134
Net Carrying Value $ 142 $ 175