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Intangible Assets - Components of Amortization Expense (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Finite-Lived Intangible Assets [Line Items]    
Total amortization expense $ 225 $ 232
Intangible asset amortization    
Finite-Lived Intangible Assets [Line Items]    
Total amortization expense 180 179
Transition and transformation contract cost amortization    
Finite-Lived Intangible Assets [Line Items]    
Total amortization expense $ 45 $ 53