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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2020
Income Taxes [Line Items]          
Effective tax rate 16.00% 17.00% 15.00% 17.00%  
Long-term income taxes $ 26,701   $ 26,701   $ 29,432
Unrecognized Tax Benefits and Other Income Tax Liabilities          
Income Taxes [Line Items]          
Long-term income taxes $ 15,400   $ 15,400   $ 16,600