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Financing Arrangement (Senior Notes) (Details) - USD ($) $ in Millions			1 Months Ended	12 Months Ended
	Mar. 01, 2026	Mar. 01, 2021	Feb. 29, 2016	Mar. 31, 2020	Mar. 31, 2019	Feb. 24, 2016
Debt Instrument [Line Items]
Senior Notes				$ 996
Senior notes, net				$ 397	$ 994
Proceeds from Issuance of Senior Long-term Debt			$ 989
2021 Notes
Debt Instrument [Line Items]
Effective interest rate						394.00%
Debt Instrument, Convertible, Remaining Discount Amortization Period				10 months 24 days
Long-term Debt						$ 600
Debt Instrument, Maturity Date		Mar. 01, 2021
Contractual interest rate of 0.75% Convertible Senior Notes due 2016						3.70%
2026 Notes
Debt Instrument [Line Items]
Effective interest rate						4.97%
Debt Instrument, Convertible, Remaining Discount Amortization Period				5 years 10 months 24 days
Long-term Debt						$ 400
Debt Instrument, Maturity Date	Mar. 01, 2026
Contractual interest rate of 0.75% Convertible Senior Notes due 2016						4.80%
Senior Notes
Debt Instrument [Line Items]
Long-term Debt						$ 1,000
Unaccreted discount				$ (1)	1	2
Debt Issuance Costs, Net				(3)	(5)	$ (9)
Debt Instrument, Fair Value Disclosure				$ 1,030	$ 1,039
Debt Instrument, Redemption Price, Percentage				100.00%
Change of control repurchase event [Member]
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage				101.00%