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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Income Taxes [Line Items]      
Effective tax rate 14.00% 16.00%  
Long-term income taxes $ 28,204   $ 29,432
Unrecognized Tax Benefits and Other Income Tax Liabilities      
Income Taxes [Line Items]      
Long-term income taxes $ 16,900   $ 16,600