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Revenue Classified by Major Geographic Areas (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues $ 43,076 $ 36,906 $ 80,230 $ 69,961
United States        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues [1] 21,836 19,149 40,861 36,419
Other Countries        
Revenues From External Customers And Long Lived Assets [Line Items]        
Revenues $ 21,240 $ 17,757 $ 39,369 $ 33,542
[1] Includes billings to OEMs and certain multinational organizations because of the nature of these businesses and the impracticability of determining the geographic source of the revenue.