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Financial Instruments (Summary of Estimated Fair Value of Long-term Obligations and Other Short-term Borrowings) (Details) - USD ($)
$ in Millions
Jun. 30, 2022
Jun. 30, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Carrying Amount of Long-Term and other Short-Term Borrowings $ 5,315 $ 6,236
Carrying amount 5,315 6,236
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Estimated fair value $ 5,049 $ 6,751