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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Jun. 30, 2019
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Income Taxes [Line Items]            
TCJA, provisional net charge for income taxes           $ 13,700
TCJA, adjustment to provisional net charge for income taxes         $ 157  
Provision (benefit) for income taxes     $ 9,831 $ 8,755 4,448  
Income taxes paid, net of refunds     13,400 12,500 8,400  
Gross unrecognized tax benefits related to uncertain tax positions   $ 13,146 14,550 13,792 13,146 $ 11,961
Gross unrecognized tax benefits related to uncertain tax positions, if recognized would affect our effective tax rates   12,000 12,500 12,100 12,000  
Accrued interest expense related to uncertain tax positions net of federal income tax benefits   3,400 4,300 4,000 3,400  
Interest expense related to uncertain tax positions, net of income tax benefits     $ 274 $ 579 $ 515  
Regional Operating Centers            
Income Taxes [Line Items]            
Foreign earnings, taxed at rates lower than U.S. rate as a percentage of foreign income before tax     82.00% 86.00% 82.00%  
Federal            
Income Taxes [Line Items]            
Operating loss carryforwards     $ 304      
State            
Income Taxes [Line Items]            
Operating loss carryforwards     1,300      
Foreign Country            
Income Taxes [Line Items]            
Operating loss carryforwards     $ 2,000      
Removal of operating loss carryforwards       $ 2,000    
Removal of operating loss carryforwards, valuation allowance       $ 2,000    
Earliest Tax Year            
Income Taxes [Line Items]            
Tax years impacted 1996          
Earliest Tax Year | Federal and State            
Income Taxes [Line Items]            
Operating loss carryforwards expiration year     2022      
Latest Tax Year            
Income Taxes [Line Items]            
Tax years impacted 2016          
Latest Tax Year | Federal and State            
Income Taxes [Line Items]            
Operating loss carryforwards expiration year     2041      
India Supreme Court            
Income Taxes [Line Items]            
Provision (benefit) for income taxes $ (620)          
Transfer of Intangible Properties            
Income Taxes [Line Items]            
Provision (benefit) for income taxes   $ (2,600)     $ (2,600)