Short-Term Financing (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Short-term Debt [Line Items]
Outstanding borrowings	$ 0.0
Maturities of commercial paper range	overnight to up to 364 days
Commercial Paper	$ 0.0	$ 0.0
Maturities of short-term funding agreements	overnight to up to five business days
Obligations under reverse repurchase agreements	$ 0.0	0.0
364-Day Credit Agreement [Member]
Short-term Debt [Line Items]
Maximum borrowing capacity under credit facilities	$ 3,250.0
Term of credit	364 days
Expiration date of credit facilities	Jun. 16, 2017
Commercial Paper [Member]
Short-term Debt [Line Items]
Debt Instrument, Description	8250
Aggregate amount of commercial paper issuable under the short-term commercial paper program	$ 9,250.0
Short-term Debt, Average Outstanding Amount	$ 2,700.0	$ 2,300.0
Debt Instrument, Interest Rate During Period	0.30%	0.10%
Credit Facility Expiring In June 2015 [Member]
Short-term Debt [Line Items]
Maximum borrowing capacity under credit facilities	$ 3,750.0
Term of credit	5 years
Expiration date of credit facilities	Jun. 18, 2021
Line of credit facility potentially available increase in maximum borrowing capacity	$ 500.0
Credit Facility Expiring In June 2018 [Member]
Short-term Debt [Line Items]
Maximum borrowing capacity under credit facilities	$ 2,250.0
Term of credit	5 years
Expiration date of credit facilities	Jun. 17, 2020
Line of credit facility potentially available increase in maximum borrowing capacity	$ 500.0
Short-Term Commercial Paper Program [Member]
Short-term Debt [Line Items]
Weighted average maturity of borrowings under the short-term commercial paper program	2 days	2 days
Reverse Repurchase Agreements [Member]
Short-term Debt [Line Items]
Short-term Debt, Average Outstanding Amount	$ 341.0	$ 421.2
Debt Instrument, Interest Rate During Period	0.40%	0.40%