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Debt (Details)
9 Months Ended
Mar. 31, 2018
USD ($)
Debt [Line Items]  
Maximum board-authorized aggregate commercial paper limit $ 2,000,000,000
Carrying value of total debt 8,300,000,000
Aggregate outstanding commercial paper and short-term debt minimum amount outstanding during period 254,500,000
Maximum amount outstanding 1,500,000,000
Commercial Paper  
Debt [Line Items]  
Carrying value of total debt $ 758,000,000