Notional Amounts of Outstanding Derivative Instruments Measured in U.S. Dollar Equivalents (Detail) - USD ($) $ in Millions	Sep. 30, 2020	Jun. 30, 2020
Designated as Hedging Instruments | Foreign Exchange Contracts | Derivatives Purchased
Derivative [Line Items]
Notional amounts	$ 635	$ 635
Designated as Hedging Instruments | Foreign Exchange Contracts | Derivatives Sold
Derivative [Line Items]
Notional amounts	6,844	6,754
Designated as Hedging Instruments | Interest Rate Contracts | Derivatives Purchased
Derivative [Line Items]
Notional amounts	1,292	1,295
Not Designated as Hedging Instruments | Foreign Exchange Contracts | Derivatives Purchased
Derivative [Line Items]
Notional amounts	11,935	11,896
Not Designated as Hedging Instruments | Foreign Exchange Contracts | Derivatives Sold
Derivative [Line Items]
Notional amounts	10,903	15,595
Not Designated as Hedging Instruments | Other Contracts | Derivatives Purchased
Derivative [Line Items]
Notional amounts	2,202	1,844
Not Designated as Hedging Instruments | Other Contracts | Derivatives Sold
Derivative [Line Items]
Notional amounts	$ 749	$ 757