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Financing Arrangement (Senior Notes) (Details) - USD ($) $ in Millions	1 Months Ended	6 Months Ended
	Feb. 29, 2016	Sep. 30, 2016	Mar. 31, 2016	Feb. 24, 2016
Debt Instrument [Line Items]
Senior Notes, Noncurrent		$ 990	$ 989
Proceeds from Issuance of Senior Long-term Debt	$ 989
2021 Notes
Debt Instrument [Line Items]
Effective interest rate				3.94%
Debt Instrument, Convertible, Remaining Discount Amortization Period		4 years 5 months
Long-term Debt				$ 600
Debt Instrument, Interest Rate, Stated Percentage				3.70%
Debt Instrument, Maturity Date	Mar. 01, 2021
2026 Notes
Debt Instrument [Line Items]
Effective interest rate				4.97%
Debt Instrument, Convertible, Remaining Discount Amortization Period		9 years 5 months
Long-term Debt				$ 400
Debt Instrument, Interest Rate, Stated Percentage				4.80%
Debt Instrument, Maturity Date	Mar. 01, 2026
Senior Notes
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	Feb. 24, 2016
Long-term Debt				$ 1,000
Debt Instrument, Unamortized Discount (Premium), Net		$ (2)	(2)	(2)
Debt Issuance Costs, Noncurrent, Net		(8)	(9)	$ (9)
Debt Instrument, Fair Value Disclosure		$ 1,082	$ 1,039
Senior Notes, Frequency of Periodic Payment	semiannually
Debt Instrument, Redemption Price, Percentage		100.00%
Change of control repurchase event
Debt Instrument [Line Items]
Debt Instrument, Redemption Price, Percentage		101.00%