Debt (Detail) - USD ($) $ in Millions		9 Months Ended
		Mar. 31, 2022	Jun. 30, 2021
Debt Instrument [Line Items]
Total face value		$ 55,666	$ 63,910
Unamortized discount and issuance costs		(481)	(511)
Hedge fair value adjustments	[1]	(43)	40
Premium on debt exchange	[2]	(5,216)	(5,293)
Total debt		49,926	58,146
Current portion of long-term debt		(1,749)	(8,072)
Long-term debt		$ 48,177	50,074
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	520
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	486
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	718
2012 Issuance of $2.3 billion
Debt Instrument [Line Items]
Total face value	[2]	$ 1,204	1,204
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	2,814
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		$ 2,559	4,803
2013 Issuance of €4.1 billion | Minimum
Debt Instrument [Line Items]
Maturities (calendar year)		2028
Stated Interest Rate		2.63%
Effective Interest Rate		2.69%
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]	$ 10,805	12,305
2015 Issuance of $23.8 billion | Minimum
Debt Instrument [Line Items]
Maturities (calendar year)	[2]	2022
Stated Interest Rate	[2]	2.65%
Effective Interest Rate	[2]	2.72%
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]	$ 9,430	12,180
2016 Issuance of $19.8 billion | Minimum
Debt Instrument [Line Items]
Maturities (calendar year)	[2]	2023
Stated Interest Rate	[2]	2.00%
Effective Interest Rate	[2]	2.10%
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]	$ 8,945	10,695
2017 Issuance of $17.0 billion | Minimum
Debt Instrument [Line Items]
Maturities (calendar year)	[2]	2024
Stated Interest Rate	[2]	2.88%
Effective Interest Rate	[2]	3.04%
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	$ 8,185
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.