Short-Term Financing (Details) (USD $)	3 Months Ended		3 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Sep. 30, 2014 364-Day Credit Agreement [Member]	Sep. 30, 2014 Credit Facility Expiring In June 2015 [Member]	Sep. 30, 2014 Credit Facility Expiring In June 2018 [Member]	Sep. 30, 2014 Short-Term Commercial Paper Program [Member]	Sep. 30, 2013 Short-Term Commercial Paper Program [Member]	Sep. 30, 2014 Reverse Repurchase Agreements [Member]	Sep. 30, 2013 Reverse Repurchase Agreements [Member]
Short-term Debt [Line Items]
Maximum borrowing capacity under credit facilities			$ 2,250,000,000	$ 3,250,000,000	$ 2,000,000,000			$ 3,250,000,000
Credit agreement period	364 days
Term of credit				5 years	5 years
Expiration date of credit facilities			Jun. 01, 2015	Jun. 01, 2019	Jun. 01, 2018
Line of credit facility potentially available increase in maximum borrowing capacity				500,000,000
Short-term Debt			0
Aggregate amount of commercial paper issuable under the short-term commercial paper program	7,500,000,000
Maturities of commercial paper range	overnight to up to 364 days
Obligation under commercial paper borrowing	1,937,000,000	2,173,000,000
Short-term Debt, Average Outstanding Amount						3,100,000,000	3,100,000,000	570,700,000	529,400,000
Weighted average interest rates						0.10%	0.10%	0.40%	0.50%
Commercial Paper Weight Average Maturity						2 days	2 days
Maturities of short-term funding agreements	overnight to up to five business days
Obligations under reverse repurchase agreements		$ 0