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Revenue Classified by Major Geographic Areas (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Revenues From External Customers And Long Lived Assets [Line Items]                      
Revenues $ 38,033 $ 35,021 $ 36,906 $ 33,055 $ 33,717 $ 30,571 $ 32,471 $ 29,084 $ 143,015 $ 125,843 $ 110,360
United States                      
Revenues From External Customers And Long Lived Assets [Line Items]                      
Revenues [1]                 73,160 64,199 55,926
Other Countries                      
Revenues From External Customers And Long Lived Assets [Line Items]                      
Revenues                 $ 69,855 $ 61,644 $ 54,434
[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.