Fair Values of Derivative Instruments (Detail) - USD ($) $ in Millions	Sep. 30, 2020	Jun. 30, 2020
Derivatives Fair Value [Line Items]
Derivative Assets	$ 276	$ 400
Gross amounts of derivatives offset in the balance sheet, assets	(74)	(154)
Cash collateral received, assets	0	0
Net amounts of derivatives, assets	202	246
Derivative Liabilities	(341)	(399)
Gross amounts of derivatives offset in the balance sheet, liabilities	76	158
Cash collateral received, liabilities	(58)	(154)
Net amounts of derivatives, liabilities	(323)	(395)
Level 1
Derivatives Fair Value [Line Items]
Derivative Assets	0	1
Derivative Liabilities	0	0
Level 2
Derivatives Fair Value [Line Items]
Derivative Assets	275	398
Derivative Liabilities	(341)	(399)
Level 3
Derivatives Fair Value [Line Items]
Derivative Assets	1	1
Derivative Liabilities	0	0
Designated as Hedging Instruments | Foreign Exchange Contracts
Derivatives Fair Value [Line Items]
Derivative Assets	16	44
Derivative Liabilities	(67)	(54)
Designated as Hedging Instruments | Interest Rate Contracts
Derivatives Fair Value [Line Items]
Derivative Assets	89	93
Derivative Liabilities	0	0
Not Designated as Hedging Instruments | Foreign Exchange Contracts
Derivatives Fair Value [Line Items]
Derivative Assets	165	245
Derivative Liabilities	(247)	(334)
Not Designated as Hedging Instruments | Other Contracts
Derivatives Fair Value [Line Items]
Derivative Assets	6	18
Derivative Liabilities	(27)	(11)
Short-term Investments
Derivatives Fair Value [Line Items]
Net amounts of derivatives, assets	28	35
Other Current Assets
Derivatives Fair Value [Line Items]
Net amounts of derivatives, assets	81	199
Other Long-term Assets
Derivatives Fair Value [Line Items]
Net amounts of derivatives, assets	93	12
Other Current Liabilities
Derivatives Fair Value [Line Items]
Net amounts of derivatives, liabilities	(232)	(334)
Other Long-term Liabilities
Derivatives Fair Value [Line Items]
Net amounts of derivatives, liabilities	$ (91)	$ (61)