Debt (Detail) - USD ($) $ in Millions		12 Months Ended
		Jun. 30, 2021	Jun. 30, 2020
Debt Instrument [Line Items]
Total face value		$ 63,910	$ 67,407
Unamortized discount and issuance costs		(511)	(554)
Hedge fair value adjustments	[1]	40	93
Premium on debt exchange	[2]	(5,293)	(3,619)
Total debt		58,146	63,327
Current portion of long-term debt		(8,072)	(3,749)
Long-term debt		$ 50,074	59,578
2009 Issuance of $3.8 billion
Debt Instrument [Line Items]
Maturities (calendar year)	[2]	2039
Stated Interest Rate	[2]	5.20%
Effective Interest Rate	[2]	5.24%
Total face value	[2]	$ 520	559
2010 Issuance of $4.8 billion
Debt Instrument [Line Items]
Maturities (calendar year)	[2]	2040
Stated Interest Rate	[2]	4.50%
Effective Interest Rate	[2]	4.57%
Total face value	[2]	$ 486	1,571
2011 Issuance of $2.3 billion
Debt Instrument [Line Items]
Maturities (calendar year)	[2]	2041
Stated Interest Rate	[2]	5.30%
Effective Interest Rate	[2]	5.36%
Total face value	[2]	$ 718	1,270
2012 Issuance of $2.3 billion
Debt Instrument [Line Items]
Total face value	[2]	$ 1,204	1,650
2012 Issuance of $2.3 billion | Minimum
Debt Instrument [Line Items]
Maturities (calendar year)	[2]	2022
Stated Interest Rate	[2]	2.13%
Effective Interest Rate	[2]	2.24%
2012 Issuance of $2.3 billion | Maximum
Debt Instrument [Line Items]
Maturities (calendar year)	[2]	2042
Stated Interest Rate	[2]	3.50%
Effective Interest Rate	[2]	3.57%
2013 Issuance of $5.2 billion
Debt Instrument [Line Items]
Total face value	[2]	$ 2,814	2,919
2013 Issuance of $5.2 billion | Minimum
Debt Instrument [Line Items]
Maturities (calendar year)	[2]	2023
Stated Interest Rate	[2]	2.38%
Effective Interest Rate	[2]	2.47%
2013 Issuance of $5.2 billion | Maximum
Debt Instrument [Line Items]
Maturities (calendar year)	[2]	2043
Stated Interest Rate	[2]	4.88%
Effective Interest Rate	[2]	4.92%
2013 Issuance of €4.1 billion
Debt Instrument [Line Items]
Total face value		$ 4,803	4,549
2013 Issuance of €4.1 billion | Minimum
Debt Instrument [Line Items]
Maturities (calendar year)		2021
Stated Interest Rate		2.13%
Effective Interest Rate		2.23%
2013 Issuance of €4.1 billion | Maximum
Debt Instrument [Line Items]
Maturities (calendar year)		2033
Stated Interest Rate		3.13%
Effective Interest Rate		3.22%
2015 Issuance of $23.8 billion
Debt Instrument [Line Items]
Total face value	[2]	$ 12,305	15,549
2015 Issuance of $23.8 billion | Minimum
Debt Instrument [Line Items]
Maturities (calendar year)	[2]	2022
Stated Interest Rate	[2]	2.38%
Effective Interest Rate	[2]	2.47%
2015 Issuance of $23.8 billion | Maximum
Debt Instrument [Line Items]
Maturities (calendar year)	[2]	2055
Stated Interest Rate	[2]	4.75%
Effective Interest Rate	[2]	4.78%
2016 Issuance of $19.8 billion
Debt Instrument [Line Items]
Total face value	[2]	$ 12,180	16,955
2016 Issuance of $19.8 billion | Minimum
Debt Instrument [Line Items]
Maturities (calendar year)	[2]	2021
Stated Interest Rate	[2]	1.55%
Effective Interest Rate	[2]	1.64%
2016 Issuance of $19.8 billion | Maximum
Debt Instrument [Line Items]
Maturities (calendar year)	[2]	2056
Stated Interest Rate	[2]	3.95%
Effective Interest Rate	[2]	4.03%
2017 Issuance of $17.0 billion
Debt Instrument [Line Items]
Total face value	[2]	$ 10,695	12,385
2017 Issuance of $17.0 billion | Minimum
Debt Instrument [Line Items]
Maturities (calendar year)	[2]	2022
Stated Interest Rate	[2]	2.40%
Effective Interest Rate	[2]	2.52%
2017 Issuance of $17.0 billion | Maximum
Debt Instrument [Line Items]
Maturities (calendar year)	[2]	2057
Stated Interest Rate	[2]	4.50%
Effective Interest Rate	[2]	4.53%
2020 Issuance of $10.0 billion
Debt Instrument [Line Items]
Total face value	[2]	$ 10,000	10,000
2020 Issuance of $10.0 billion | Minimum
Debt Instrument [Line Items]
Maturities (calendar year)	[2]	2050
Stated Interest Rate	[2]	2.53%
Effective Interest Rate	[2]	2.53%
2020 Issuance of $10.0 billion | Maximum
Debt Instrument [Line Items]
Maturities (calendar year)	[2]	2060
Stated Interest Rate	[2]	2.68%
Effective Interest Rate	[2]	2.68%
2021 issuance of $8.2 billion
Debt Instrument [Line Items]
Total face value	[2]	$ 8,185	$ 0
2021 issuance of $8.2 billion | Minimum
Debt Instrument [Line Items]
Maturities (calendar year)	[2]	2052
Stated Interest Rate	[2]	2.92%
Effective Interest Rate	[2]	2.92%
2021 issuance of $8.2 billion | Maximum
Debt Instrument [Line Items]
Maturities (calendar year)	[2]	2062
Stated Interest Rate	[2]	3.04%
Effective Interest Rate	[2]	3.04%

[1] Refer to Note 5 – Derivatives for further information on the interest rate swaps related to fixed-rate debt.

[2] In March 2021 and June 2020, we exchanged a portion of our existing debt at a premium for cash and new debt with longer maturities. The premiums are amortized over the terms of the new debt.