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Financing Arrangement (Senior Notes) (Details) - USD ($) $ in Millions		1 Months Ended	12 Months Ended
	Feb. 11, 2021	Feb. 29, 2016	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020	Feb. 24, 2016
Debt Instrument [Line Items]
Senior Notes			$ 1,878	$ 1,876
Proceeds from Debt, Net of Issuance Costs	$ 1,478	$ 395	$ 0	1,478	$ 0
Senior Notes, Frequency of Periodic Payment			semiannually
2026 Notes
Debt Instrument [Line Items]
Effective interest rate						4.97%
Debt Instrument, Convertible, Remaining Discount Amortization Period			3 years 10 months 24 days
Long-term Debt			$ 400	400		$ 400
Debt Instrument, Maturity Date			Mar. 01, 2026
Contractual interest rate of 0.75% Convertible Senior Notes due 2016						4.80%
2031 Notes
Debt Instrument [Line Items]
Effective interest rate	1.98%
Debt Instrument, Convertible, Remaining Discount Amortization Period			8 years 10 months 24 days
Long-term Debt	$ 750		$ 750	750
Debt Instrument, Maturity Date			Feb. 15, 2031
Contractual interest rate of 0.75% Convertible Senior Notes due 2016	1.85%
2051 Notes
Debt Instrument [Line Items]
Effective interest rate	3.04%
Debt Instrument, Convertible, Remaining Discount Amortization Period			28 years 10 months 24 days
Long-term Debt	$ 750		$ 750	750
Debt Instrument, Maturity Date			Feb. 15, 2051
Contractual interest rate of 0.75% Convertible Senior Notes due 2016	2.95%
Senior Notes
Debt Instrument [Line Items]
Long-term Debt			$ 1,900	1,900
Unaccreted discount	$ 6		(6)	(7)		$ 1
Debt Issuance Costs, Net	$ (16)		(16)	(17)		$ (4)
Debt Instrument, Fair Value Disclosure			$ 1,711	$ 1,873
Debt Instrument, Redemption Price, Percentage			100.00%
Change of control repurchase event [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage			101.00%