Long-Term Obligations and Other Short-Term Borrowings Long-Term Debt (Details) - USD ($) $ in Millions	1 Months Ended		12 Months Ended
	Nov. 30, 2019	Jun. 30, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Debt Instrument [Line Items]
Accounts payable			$ 21,374	$ 21,535
Offer as percentage of principal amount			101.00%
Gain (Loss) on Extinguishment of Debt			$ (16)	0	$ (2)
Notes Payable Repurchased				100
1.948% Notes due 2019
Debt Instrument [Line Items]
Notes Payable Repurchased				1,000
2.616% Notes due fiscal 2022
Debt Instrument [Line Items]
Notes Payable Repurchased			247	67
3.41% Notes due fiscal 2027
Debt Instrument [Line Items]
Notes Payable Repurchased			104	24
4.368% Notes due fiscal 2047
Debt Instrument [Line Items]
Notes Payable Repurchased			35
2.616% Notes, 3.2% Notes, 3.41% Notes, 4.6% Notes, 4.9% Notes and 4.368% Notes [Member]
Debt Instrument [Line Items]
Gain (Loss) on Extinguishment of Debt			9
Floating Rate Notes due fiscal 2022
Debt Instrument [Line Items]
Notes Payable Repurchased			20	8
1.95% Notes due 2018
Debt Instrument [Line Items]
Proceeds from (Repayments of) Notes Payable		$ 550
2.4% Notes due 2019
Debt Instrument [Line Items]
Repayments of Notes Payable	$ 450
3.2% Notes due 2022
Debt Instrument [Line Items]
Notes Payable Repurchased				$ 1
3.2% Notes due 2023
Debt Instrument [Line Items]
Notes Payable Repurchased			11
4.6% Notes due 2043
Debt Instrument [Line Items]
Notes Payable Repurchased			6
4.625% Notes due 2020
Debt Instrument [Line Items]
Gain (Loss) on Extinguishment of Debt			7
Notes Payable Repurchased			500
4.9% Notes due 2045
Debt Instrument [Line Items]
Notes Payable Repurchased			$ 5
7.0% Debentures due 2026 | Allegiance Corporation
Debt Instrument [Line Items]
Stated interest rate			7.00%