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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Income Taxes [Line Items]          
TCJA, adjustment to provisional net charge for income taxes   $ 157      
Effective tax rate 17.00% 19.00% 17.00% 16.00%  
Long-term income taxes $ 28,754   $ 28,754   $ 29,612
Unrecognized Tax Benefits and Other Income Tax Liabilities          
Income Taxes [Line Items]          
Long-term income taxes $ 16,000   $ 16,000   $ 15,300