Long-Term Obligations and Other Short-Term Borrowings (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Jun. 30, 2020
Debt Instrument [Line Items]
Total Long-Term and Short-Term Obligations	$ 6,700		$ 6,700		$ 6,800
Gain (Loss) on Extinguishment of Debt	0	$ (4)	(1)	$ (4)
Accounts Payable	23,200		23,200		$ 21,400
Commercial Paper [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	2,000		2,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	2,000		2,000
2.4% Notes due 2020 [Member]
Debt Instrument [Line Items]
Notes Payable Repurchased				450
2.616% Notes due 2022 [Member]
Debt Instrument [Line Items]
Notes Payable Repurchased			2	207
3.41% Notes due 2027 [Member]
Debt Instrument [Line Items]
Notes Payable Repurchased				81
Committed Receivables Sales Facility Program [Member] | Short Term Credit Facilities Member
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,000		1,000
4.6% Notes due 2043 [Member]
Debt Instrument [Line Items]
Notes Payable Repurchased				6
4.9% Notes due 2045 [Member]
Debt Instrument [Line Items]
Notes Payable Repurchased				2
4.368% Notes due 2047 [Member]
Debt Instrument [Line Items]
Notes Payable Repurchased				21
Floating Rate Notes due 2022 [Member]
Debt Instrument [Line Items]
Notes Payable Repurchased			$ 40	14
3.2% Notes due 2022 [Member]
Debt Instrument [Line Items]
Notes Payable Repurchased				$ 10