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Financing Arrangements - Senior Notes Narrative (Details) - USD ($) $ in Millions	1 Months Ended		6 Months Ended
	Feb. 28, 2021	Feb. 29, 2016	Sep. 30, 2024	Mar. 31, 2024
Debt Instrument [Line Items]
Proceeds from debt, net of issuance costs	$ 1,478
Amortization of debt discount (premium)	6
Debt issuance costs, gross	16
Proceeds from issuance of senior long-term debt		$ 395
2031 Notes
Debt Instrument [Line Items]
Long-term debt	$ 750		$ 750	$ 750
Debt instrument, interest rate, stated percentage	1.85%		1.85%
Debt instrument, interest rate, effective percentage	1.98%
Debt instrument, convertible, remaining discount amortization period			6 years 4 months 24 days
2051 Notes
Debt Instrument [Line Items]
Long-term debt	$ 750		$ 750	750
Debt instrument, interest rate, stated percentage	2.95%		2.95%
Debt instrument, interest rate, effective percentage	3.04%
Debt instrument, convertible, remaining discount amortization period			26 years 4 months 24 days
2026 Notes
Debt Instrument [Line Items]
Long-term debt		$ 400	$ 400	400
Debt instrument, interest rate, stated percentage		4.80%	4.80%
Debt instrument, interest rate, effective percentage		4.97%
Debt instrument, convertible, remaining discount amortization period			1 year 4 months 24 days
Senior Notes
Debt Instrument [Line Items]
Long-term debt			$ 1,900	1,900
Debt instrument, unamortized discount (premium), net		$ (1)	(5)	(5)
Unamortized debt issuance costs		$ (4)	$ (12)	$ (13)
Debt instrument, redemption price, percentage			100.00%
Change of control repurchase event
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			101.00%