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Available-for-Sale Securities (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Sep. 30, 2014
Schedule of Available-for-sale Securities [Line Items]  
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities $ 0
Short Term
 
Schedule of Available-for-sale Securities [Line Items]  
Weighted average effective maturity 5 months
Long Term
 
Schedule of Available-for-sale Securities [Line Items]  
Weighted average effective maturity 17 months