Intangible Assets - Components of Amortization Expense (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 231	$ 251
Intangible assets amortization
Finite-Lived Intangible Assets [Line Items]
Amortization expense	183	199
Transition and transformation contract cost amortization
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 48	$ 52