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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Income Taxes [Line Items]            
TCJA, provisional net charge for income taxes         $ 13,700  
TCJA, adjustment to provisional net charge for income taxes   $ 157   $ 157    
Provision (benefit) for income taxes     $ 8,755 4,448 19,903  
Income taxes paid, net of refunds     12,500 8,400 5,500  
Gross unrecognized tax benefits related to uncertain tax positions $ 13,146   13,792 13,146 11,961 $ 11,737
Gross unrecognized tax benefits related to uncertain tax positions, if recognized would affect our effective tax rates 12,000   12,100 12,000 11,300  
Accrued interest expense related to uncertain tax positions net of federal income tax benefits 3,400   4,000 3,400 3,000  
Interest expense related to uncertain tax positions, net of income tax benefits     $ 579 $ 515 $ 688  
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     86.00% 82.00% 87.00%  
Federal            
Income Taxes [Line Items]            
Operating loss carryforwards     $ 547      
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      
State            
Income Taxes [Line Items]            
Operating loss carryforwards     $ 975      
Federal and State | Earliest Tax Year            
Income Taxes [Line Items]            
Operating loss carryforwards expiration year     2021      
Federal and State | Latest Tax Year            
Income Taxes [Line Items]            
Operating loss carryforwards expiration year     2040      
Transfer of Intangible Properties            
Income Taxes [Line Items]            
Provision (benefit) for income taxes $ (2,600)     $ (2,600)