Fair Values of Derivative Instruments (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019
Derivatives Fair Value [Line Items]
Derivative Assets	$ 181	$ 250
Gross amounts of derivatives offset in the balance sheet, assets	(121)	(113)
Cash collateral received, assets	0	0
Net amounts of derivatives, assets	60	137
Derivative Liabilities	(324)	(272)
Gross amounts of derivatives offset in the balance sheet, liabilities	122	114
Cash collateral received, liabilities	(5)	(78)
Net amounts of derivatives, liabilities	(207)	(236)
Level 1
Derivatives Fair Value [Line Items]
Derivative Assets	0	0
Derivative Liabilities	0	0
Level 2
Derivatives Fair Value [Line Items]
Derivative Assets	178	247
Derivative Liabilities	(324)	(272)
Level 3
Derivatives Fair Value [Line Items]
Derivative Assets	3	3
Derivative Liabilities	0	0
Designated as Hedging Instruments | Interest Rate Contracts
Derivatives Fair Value [Line Items]
Derivative Assets	2	0
Derivative Liabilities	(1)	0
Designated as Hedging Instruments | Foreign Exchange Contracts
Derivatives Fair Value [Line Items]
Derivative Assets	47	0
Derivative Liabilities	(9)	(93)
Not Designated as Hedging Instruments | Foreign Exchange Contracts
Derivatives Fair Value [Line Items]
Derivative Assets	122	204
Derivative Liabilities	(295)	(172)
Not Designated as Hedging Instruments | Other Contracts
Derivatives Fair Value [Line Items]
Derivative Assets	10	46
Derivative Liabilities	(19)	(7)
Short-term Investments
Derivatives Fair Value [Line Items]
Net amounts of derivatives, assets	27	(13)
Other Current Assets
Derivatives Fair Value [Line Items]
Net amounts of derivatives, assets	33	146
Other Long-term Assets
Derivatives Fair Value [Line Items]
Net amounts of derivatives, assets	0	4
Other Current Liabilities
Derivatives Fair Value [Line Items]
Net amounts of derivatives, liabilities	(151)	(221)
Other Long-term Liabilities
Derivatives Fair Value [Line Items]
Net amounts of derivatives, liabilities	$ (56)	$ (15)