Long-Lived Assets, Excluding Financial Instruments and Tax Assets, Classified by Location of Controlling Statutory Company (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Certain Long-Lived Assets by Geography [Line Items]
Long-lived assets	$ 79,882	$ 75,517	$ 45,159
United States
Certain Long-Lived Assets by Geography [Line Items]
Long-lived assets	44,501	42,730	25,145
Ireland
Certain Long-Lived Assets by Geography [Line Items]
Long-lived assets	12,843	12,889	2,099
Luxembourg
Certain Long-Lived Assets by Geography [Line Items]
Long-lived assets	6,856	6,854	6,868
Other Countries
Certain Long-Lived Assets by Geography [Line Items]
Long-lived assets	$ 15,682	$ 13,044	$ 11,047