Investment Components (Detail) - USD ($) $ in Millions		Mar. 31, 2021	Jun. 30, 2020
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Adjusted Cost Basis		$ 113,883
Debt investments, Recorded Basis		117,749
Derivative, net		471	$ 246
Cash and cash equivalents		13,702	13,576
Short-term Investments		111,705	122,951
Equity Investments		5,395	2,965
Cash, cash equivalents, and investments		130,802	139,492
Equity investments
Cash, Cash Equivalents and Investments [Line Items]
Equity investments, Recorded Basis		6,345	3,749
Cash and cash equivalents		950	784
Short-term Investments		0	0
Equity Investments		5,395	2,965
Equity investments | Other
Cash, Cash Equivalents and Investments [Line Items]
Equity investments, Recorded Basis		4,753	2,551
Cash and cash equivalents		0	0
Short-term Investments		0	0
Equity Investments		4,753	2,551
Equity investments | Level 1
Cash, Cash Equivalents and Investments [Line Items]
Equity investments, Recorded Basis		1,592	1,198
Cash and cash equivalents		950	784
Short-term Investments		0	0
Equity Investments		642	414
Cash
Cash, Cash Equivalents and Investments [Line Items]
Cash		6,314	5,910
Cash and cash equivalents		6,314	5,910
Short-term Investments		0	0
Equity Investments		0	0
Derivatives, net
Cash, Cash Equivalents and Investments [Line Items]
Derivative, net	[1]	394	35
Cash and cash equivalents	[1]	0	0
Short-term Investments	[1]	394	35
Equity Investments	[1]	0	0
Debt investments
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Adjusted Cost Basis		113,883	122,900
Debt investments, Unrealized Gains		4,126	6,929
Debt investments, Unrealized Losses		(260)	(31)
Debt investments, Recorded Basis		117,749	129,798
Cash and cash equivalents		6,438	6,882
Short-term Investments		111,311	122,916
Equity Investments		0	0
Debt investments | Commercial Paper | Level 2
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Adjusted Cost Basis		4,435	4,687
Debt investments, Unrealized Gains		0	1
Debt investments, Unrealized Losses		0	0
Debt investments, Recorded Basis		4,435	4,688
Cash and cash equivalents		2,314	1,618
Short-term Investments		2,121	3,070
Equity Investments		0	0
Debt investments | Certificates of deposit | Level 2
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Adjusted Cost Basis		3,000	2,898
Debt investments, Unrealized Gains		0	0
Debt investments, Unrealized Losses		0	0
Debt investments, Recorded Basis		3,000	2,898
Cash and cash equivalents		2,402	1,646
Short-term Investments		598	1,252
Equity Investments		0	0
Debt investments | U.S. government securities | Level 1
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Adjusted Cost Basis		86,198	92,067
Debt investments, Unrealized Gains		3,789	6,495
Debt investments, Unrealized Losses		(223)	(1)
Debt investments, Recorded Basis		89,764	98,561
Cash and cash equivalents		2	3,168
Short-term Investments		89,762	95,393
Equity Investments		0	0
Debt investments | U.S. agency securities | Level 2
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Adjusted Cost Basis		907	2,439
Debt investments, Unrealized Gains		2	2
Debt investments, Unrealized Losses		0	0
Debt investments, Recorded Basis		909	2,441
Cash and cash equivalents		0	449
Short-term Investments		909	1,992
Equity Investments		0	0
Debt investments | Foreign government bonds | Level 2
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Adjusted Cost Basis		6,756	6,982
Debt investments, Unrealized Gains		7	6
Debt investments, Unrealized Losses		(3)	(3)
Debt investments, Recorded Basis		6,760	6,985
Cash and cash equivalents		1,720	1
Short-term Investments		5,040	6,984
Equity Investments		0	0
Debt investments | Mortgage- and asset-backed securities | Level 2
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Adjusted Cost Basis		3,882	4,865
Debt investments, Unrealized Gains		23	41
Debt investments, Unrealized Losses		(10)	(6)
Debt investments, Recorded Basis		3,895	4,900
Cash and cash equivalents		0	0
Short-term Investments		3,895	4,900
Equity Investments		0	0
Debt investments | Corporate notes and bonds | Level 2
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Adjusted Cost Basis		8,262	8,500
Debt investments, Unrealized Gains		251	327
Debt investments, Unrealized Losses		(17)	(17)
Debt investments, Recorded Basis		8,496	8,810
Cash and cash equivalents		0	0
Short-term Investments		8,496	8,810
Equity Investments		0	0
Debt investments | Corporate notes and bonds | Level 3
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Adjusted Cost Basis		62	58
Debt investments, Unrealized Gains		0	0
Debt investments, Unrealized Losses		0	0
Debt investments, Recorded Basis		62	58
Cash and cash equivalents		0	0
Short-term Investments		62	58
Equity Investments		0	0
Debt investments | Municipal securities | Level 2
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Adjusted Cost Basis		286	313
Debt investments, Unrealized Gains		54	57
Debt investments, Unrealized Losses		0	(4)
Debt investments, Recorded Basis		340	366
Cash and cash equivalents		0	0
Short-term Investments		340	366
Equity Investments		0	0
Debt investments | Municipal securities | Level 3
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Adjusted Cost Basis		95	91
Debt investments, Unrealized Gains		0	0
Debt investments, Unrealized Losses		(7)	0
Debt investments, Recorded Basis		88	91
Cash and cash equivalents		0	0
Short-term Investments		88	91
Equity Investments		$ 0	$ 0

[1] Refer to Note 5 – Derivatives for further information on the fair value of our derivative instruments.