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Summary of Significant Accounting Policies (Narrative) (Details)
shares in Millions, $ in Millions
12 Months Ended
Mar. 19, 2019
shares
Jun. 30, 2020
USD ($)
Customer
Jun. 30, 2019
USD ($)
Customer
Jun. 30, 2018
USD ($)
Jul. 01, 2019
USD ($)
Marketing and Advertising Expense [Abstract]          
Advertising expense   $ 425 $ 388 $ 392  
Shares distributed to stockholders of the Parent | shares 621        
Concentrations of Credit Risk [Abstract]          
Operating lease liabilities   574      
ROU assets   $ 539      
Accounting Standards Update 2016-02          
Concentrations of Credit Risk [Abstract]          
Operating lease liabilities         $ 635
ROU assets         $ 585
Receivables | Credit Concentration Risk          
Concentrations of Credit Risk [Abstract]          
Number of major customers | Customer   0 0    
Concentration of risk, Accounts receivable   $ 0 $ 0    
Leasehold Improvements          
Property, Plant and Equipment [Abstract]          
Property, plant and equipment, estimated useful lives   straight-line method over the shorter of their useful lives or the life of the lease      
Minimum          
Property, Plant and Equipment [Abstract]          
Property, plant and equipment, useful life   3 years      
Minimum | Receivables | Credit Concentration Risk          
Concentrations of Credit Risk [Abstract]          
Concentration Risk, Percentage   10.00% 10.00%    
Maximum          
Property, Plant and Equipment [Abstract]          
Property, plant and equipment, useful life   40 years