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Financing Arrangement - Senior Notes (Details) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Feb. 28, 2021	Feb. 29, 2016	Mar. 31, 2025	Mar. 31, 2024	Feb. 11, 2021	Feb. 24, 2016
Debt Instrument [Line Items]
Proceeds from issuance of senior notes, net of issuance costs	$ 1,478	$ 395
2026 Notes
Debt Instrument [Line Items]
Long-term debt		$ 400	$ 400	$ 400
Contractual interest rate of 0.75% Convertible Senior Notes due 2016		4.80%				4.80%
Effective interest rate		4.97%
Debt instrument, convertible, remaining discount amortization period			10 months 24 days
2031 Notes
Debt Instrument [Line Items]
Long-term debt	$ 750		$ 750	750
Contractual interest rate of 0.75% Convertible Senior Notes due 2016	1.85%				1.85%
Effective interest rate	1.98%
Debt instrument, convertible, remaining discount amortization period			5 years 10 months 24 days
2051 Notes
Debt Instrument [Line Items]
Long-term debt	$ 750		$ 750	750
Contractual interest rate of 0.75% Convertible Senior Notes due 2016	2.95%				2.95%
Effective interest rate	3.04%
Debt instrument, convertible, remaining discount amortization period			25 years 10 months 24 days
Senior Notes
Debt Instrument [Line Items]
Long-term debt			$ 1,900	1,900
Unaccreted discount	$ 6	$ 1	(5)	(5)
Debt issuance costs, net	$ (16)	$ (4)	$ (11)	$ (13)
Debt instrument, redemption price, percentage			100.00%
Change of control repurchase event
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage			101.00%