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Fair Value Measurements (Fair Value of Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Jun. 30, 2020
Liabilities:    
Disposal Group, Including Discontinued Operation, Assets $ 1,101 $ 0
Disposal Group, Including Discontinued Operation, Liabilities 96 0
Fair Value, Measurements, Recurring    
Assets:    
Cash equivalents 1,883 721
Other investments 126 114
Liabilities:    
Forward contracts 42 53
Fair Value, Measurements, Recurring | Level 1    
Assets:    
Cash equivalents 1,883 721
Other investments 126 114
Liabilities:    
Forward contracts 0 0
Fair Value, Measurements, Recurring | Level 2    
Assets:    
Cash equivalents 0 0
Other investments 0 0
Liabilities:    
Forward contracts 42 53
Fair Value, Measurements, Recurring | Level 3    
Assets:    
Cash equivalents 0 0
Other investments 0 0
Liabilities:    
Forward contracts 0 $ 0
Fair Value, Nonrecurring    
Liabilities:    
Disposal Group, Including Discontinued Operation, Assets $ 1,100