Long-Term Obligations and Other Short-Term Borrowings Summary of Debt (Details) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017
Debt Instrument [Line Items]
Other obligations	$ 11	$ 388
Total	9,013	10,395
Less: current portion of long-term obligations and other short-term borrowings	1,001	1,327
Long-term obligations, less current portion	8,012	9,068
1.7% Notes due 2018
Debt Instrument [Line Items]
Notes Payable	0	400
1.95% Notes due 2018
Debt Instrument [Line Items]
Notes Payable	0	547
1.948% Notes due 2019
Debt Instrument [Line Items]
Notes Payable	998	996
2.4% Notes due 2019
Debt Instrument [Line Items]
Notes Payable	448	453
4.625% Notes due 2020
Debt Instrument [Line Items]
Notes Payable	514	519
2.616% Notes due fiscal 2022
Debt Instrument [Line Items]
Notes Payable	1,143	1,142
3.2% Notes due 2022
Debt Instrument [Line Items]
Notes Payable	243	248
Floating Rate Notes due fiscal 2022
Debt Instrument [Line Items]
Notes Payable	348	347
3.2% Notes due 2023
Debt Instrument [Line Items]
Notes Payable	525	544
3.079% Notes due fiscal 2024
Debt Instrument [Line Items]
Notes Payable	742	744
3.5% Notes due fiscal 2025
Debt Instrument [Line Items]
Notes Payable	390	396
3.75% Notes due 2025
Debt Instrument [Line Items]
Notes Payable	460	481
3.41% Notes due fiscal 2027
Debt Instrument [Line Items]
Notes Payable	1,340	1,340
4.6% Notes due 2043
Debt Instrument [Line Items]
Notes Payable	346	346
4.5% Notes due 2044
Debt Instrument [Line Items]
Notes Payable	342	341
4.9% Notes due 2045
Debt Instrument [Line Items]
Notes Payable	445	445
4.368% Notes due fiscal 2047
Debt Instrument [Line Items]
Notes Payable	594	594
7.0% Debentures due 2026
Debt Instrument [Line Items]
Notes Payable	$ 124	$ 124