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Leases (Summary of Operating Lease Components of Balance Sheet and Other Supplemental Information) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Jun. 30, 2019
Leases [Abstract]    
ROU assets $ 533 $ 0
Lease liabilities    
Current lease liabilities 142 0
Non-current lease liabilities 429 $ 0
Total lease liabilities $ 571  
Other supplemental information    
Weighted average remaining lease term 7 years  
Weighted average discount rate 3.00%