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Long-Term Obligations and Other Short-Term Borrowings Summary of Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Jun. 30, 2020
Debt Instrument [Line Items]    
Total Long-Term and Short-Term Obligations $ 6,700 $ 6,800
Long-term Debt and Lease Obligation, Current 13 10
Long-term Debt and Lease Obligation $ 6,720 $ 6,765