Fair Values of Derivative Instruments (Detail) - USD ($) $ in Millions	Mar. 31, 2020	Jun. 30, 2019
Derivatives Fair Value [Line Items]
Derivative Assets	$ 412	$ 250
Gross amounts of derivatives offset in the balance sheet, assets	(128)	(113)
Cash collateral received, assets	0	0
Net amounts of derivatives, assets	284	137
Derivative Liabilities	(653)	(272)
Gross amounts of derivatives offset in the balance sheet, liabilities	134	114
Cash collateral received, liabilities	(46)	(78)
Net amounts of derivatives, liabilities	(565)	(236)
Level 1
Derivatives Fair Value [Line Items]
Derivative Assets	8	0
Derivative Liabilities	(3)	0
Level 2
Derivatives Fair Value [Line Items]
Derivative Assets	403	247
Derivative Liabilities	(650)	(272)
Level 3
Derivatives Fair Value [Line Items]
Derivative Assets	1	3
Derivative Liabilities	0	0
Designated as Hedging Instruments | Interest Rate Contracts
Derivatives Fair Value [Line Items]
Derivative Assets	80	0
Derivative Liabilities	0	0
Designated as Hedging Instruments | Foreign Exchange Contracts
Derivatives Fair Value [Line Items]
Derivative Assets	9	0
Derivative Liabilities	(141)	(93)
Not Designated as Hedging Instruments | Foreign Exchange Contracts
Derivatives Fair Value [Line Items]
Derivative Assets	301	204
Derivative Liabilities	(356)	(172)
Not Designated as Hedging Instruments | Other Contracts
Derivatives Fair Value [Line Items]
Derivative Assets	22	46
Derivative Liabilities	(156)	(7)
Short-term Investments
Derivatives Fair Value [Line Items]
Net amounts of derivatives, assets	(16)	(13)
Other Current Assets
Derivatives Fair Value [Line Items]
Net amounts of derivatives, assets	222	146
Other Long-term Assets
Derivatives Fair Value [Line Items]
Net amounts of derivatives, assets	78	4
Other Current Liabilities
Derivatives Fair Value [Line Items]
Net amounts of derivatives, liabilities	(393)	(221)
Other Long-term Liabilities
Derivatives Fair Value [Line Items]
Net amounts of derivatives, liabilities	$ (172)	$ (15)