Long-Term Obligations and Other Short-Term Borrowings (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Nov. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2019
Debt Instrument [Line Items]
Total Long-Term and Short-Term Obligations		$ 7,934		$ 7,934		$ 8,031
Gain (Loss) on Extinguishment of Debt		(4)	$ 0	(4)	$ 0
Accounts payable		21,459		21,459		$ 21,535
Commercial Paper [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Fair Value of Amount Outstanding		458		458
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]
Repayments of Notes Payable	$ 450
2.616% Notes due 2022 [Member]
Debt Instrument [Line Items]
Notes Payable Repurchased				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, Fair Value of Amount Outstanding		225		225
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
3.2% Notes due 2023 [Member]
Debt Instrument [Line Items]
Notes Payable Repurchased				10
Floating Rate Notes due 2022 [Member]
Debt Instrument [Line Items]
Notes Payable Repurchased				$ 14