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Long-Lived Assets, Excluding Financial Instruments and Tax Assets, Classified by Location of Controlling Statutory Company (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Revenues From External Customers And Long Lived Assets [Line Items]      
Long-lived assets $ 103,293 $ 93,632 $ 79,882
United States      
Revenues From External Customers And Long Lived Assets [Line Items]      
Long-lived assets 60,789 55,252 44,501
Ireland      
Revenues From External Customers And Long Lived Assets [Line Items]      
Long-lived assets 12,734 12,958 12,843
Other Countries      
Revenues From External Customers And Long Lived Assets [Line Items]      
Long-lived assets $ 29,770 $ 25,422 $ 22,538