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Debt Investment Maturities (Parenthetical) (Detail) (USD $)
In Billions, unless otherwise specified
12 Months Ended
Jun. 30, 2014
Investments Classified by Contractual Maturity Date [Line Items]  
Held to maturity investments, due date Oct. 31, 2023
Held to maturity investments, cost basis $ 1.5
Held to maturity investments, estimated fair value $ 1.7