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Financing Arrangement - Carrying Values Of Liability And Equity Components Of Notes (Details) - USD ($) $ in Millions	Mar. 31, 2025	Mar. 31, 2024	Feb. 28, 2021	Feb. 29, 2016
Debt Instrument [Line Items]
Net carrying value of Senior Notes	$ 1,884	$ 1,882
2026 Notes
Debt Instrument [Line Items]
Long-term debt	400	400		$ 400
2031 Notes
Debt Instrument [Line Items]
Long-term debt	750	750	$ 750
2051 Notes
Debt Instrument [Line Items]
Long-term debt	750	750	750
Senior Notes
Debt Instrument [Line Items]
Long-term debt	1,900	1,900
Unaccreted discount	(5)	(5)	6	1
Unamortized debt issuance costs	(11)	(13)	$ (16)	$ (4)
Fair value of Senior Notes (Level 2)	$ 1,511	$ 1,515