Investment Components (Detail) - USD ($) $ in Millions		Sep. 30, 2024	Jun. 30, 2024
Cash Cash Equivalents And Investments [Line Items]
Debt investments, Adjusted Cost Basis		$ 70,356
Debt investments, Recorded Basis		68,457
Derivative, net		122	$ 180
Cash and cash equivalents		20,840	18,315
Short-term Investments		57,588	57,228
Equity and other investments		15,778	14,600
Cash, cash equivalents, and investments		94,206	90,143
Equity Securities
Cash Cash Equivalents And Investments [Line Items]
Equity investments, Recorded Basis		15,162	13,661
Cash and cash equivalents		884	561
Short-term Investments		0	0
Equity and other investments		14,278	13,100
Equity Securities | Other
Cash Cash Equivalents And Investments [Line Items]
Equity investments, Recorded Basis		10,910	10,114
Cash and cash equivalents		0	0
Short-term Investments		0	0
Equity and other investments		10,910	10,114
Equity Securities | Level 1
Cash Cash Equivalents And Investments [Line Items]
Equity investments, Recorded Basis		4,252	3,547
Cash and cash equivalents		884	561
Short-term Investments		0	0
Equity and other investments		3,368	2,986
Cash
Cash Cash Equivalents And Investments [Line Items]
Cash		10,588	11,571
Cash and cash equivalents		10,588	11,571
Short-term Investments		0	0
Equity and other investments		0	0
Derivatives, net
Cash Cash Equivalents And Investments [Line Items]
Derivative, net	[1]	(1)	12
Cash and cash equivalents	[1]	0	0
Short-term Investments	[1]	(1)	12
Equity and other investments	[1]	0	0
Debt Securities
Cash Cash Equivalents And Investments [Line Items]
Debt investments, Adjusted Cost Basis		70,356	68,209
Debt investments, Unrealized Gains		150	38
Debt investments, Unrealized Losses		(2,049)	(3,348)
Debt investments, Recorded Basis		68,457	64,899
Cash and cash equivalents		9,368	6,183
Short-term Investments		57,589	57,216
Equity and other investments		1,500	1,500
Debt Securities | Commercial Paper | Level 2
Cash Cash Equivalents And Investments [Line Items]
Debt investments, Adjusted Cost Basis		6,513	4,666
Debt investments, Unrealized Gains		0	0
Debt investments, Unrealized Losses		0	0
Debt investments, Recorded Basis		6,513	4,666
Cash and cash equivalents		6,513	4,666
Short-term Investments		0	0
Equity and other investments		0	0
Debt Securities | Certificates of deposit | Level 2
Cash Cash Equivalents And Investments [Line Items]
Debt investments, Adjusted Cost Basis		2,899	1,547
Debt investments, Unrealized Gains		0	0
Debt investments, Unrealized Losses		0	0
Debt investments, Recorded Basis		2,899	1,547
Cash and cash equivalents		2,855	1,503
Short-term Investments		44	44
Equity and other investments		0	0
Debt Securities | U.S. government securities | Level 1
Cash Cash Equivalents And Investments [Line Items]
Debt investments, Adjusted Cost Basis		48,764	49,603
Debt investments, Unrealized Gains		16	4
Debt investments, Unrealized Losses		(1,828)	(2,948)
Debt investments, Recorded Basis		46,952	46,659
Cash and cash equivalents		0	14
Short-term Investments		46,952	46,645
Equity and other investments		0	0
Debt Securities | U.S. agency securities | Level 2
Cash Cash Equivalents And Investments [Line Items]
Debt investments, Adjusted Cost Basis		17	17
Debt investments, Unrealized Gains		0	0
Debt investments, Unrealized Losses		0	0
Debt investments, Recorded Basis		17	17
Cash and cash equivalents		0	0
Short-term Investments		17	17
Equity and other investments		0	0
Debt Securities | Foreign government bonds | Level 2
Cash Cash Equivalents And Investments [Line Items]
Debt investments, Adjusted Cost Basis		288	319
Debt investments, Unrealized Gains		8	3
Debt investments, Unrealized Losses		(9)	(16)
Debt investments, Recorded Basis		287	306
Cash and cash equivalents		0	0
Short-term Investments		287	306
Equity and other investments		0	0
Debt Securities | Mortgage- and asset-backed securities | Level 2
Cash Cash Equivalents And Investments [Line Items]
Debt investments, Adjusted Cost Basis		937	944
Debt investments, Unrealized Gains		10	3
Debt investments, Unrealized Losses		(22)	(35)
Debt investments, Recorded Basis		925	912
Cash and cash equivalents		0	0
Short-term Investments		925	912
Equity and other investments		0	0
Debt Securities | Corporate notes and bonds | Level 2
Cash Cash Equivalents And Investments [Line Items]
Debt investments, Adjusted Cost Basis		8,932	9,106
Debt investments, Unrealized Gains		114	28
Debt investments, Unrealized Losses		(166)	(318)
Debt investments, Recorded Basis		8,880	8,816
Cash and cash equivalents		0	0
Short-term Investments		8,880	8,816
Equity and other investments		0	0
Debt Securities | Corporate notes and bonds | Level 3
Cash Cash Equivalents And Investments [Line Items]
Debt investments, Adjusted Cost Basis		1,639	1,641
Debt investments, Unrealized Gains		0	0
Debt investments, Unrealized Losses		(1)	(1)
Debt investments, Recorded Basis		1,638	1,640
Cash and cash equivalents		0	0
Short-term Investments		138	140
Equity and other investments		1,500	1,500
Debt Securities | Municipal securities | Level 2
Cash Cash Equivalents And Investments [Line Items]
Debt investments, Adjusted Cost Basis		263	262
Debt investments, Unrealized Gains		2	0
Debt investments, Unrealized Losses		(8)	(13)
Debt investments, Recorded Basis		257	249
Cash and cash equivalents		0	0
Short-term Investments		257	249
Equity and other investments		0	0
Debt Securities | Municipal securities | Level 3
Cash Cash Equivalents And Investments [Line Items]
Debt investments, Adjusted Cost Basis		104	104
Debt investments, Unrealized Gains		0	0
Debt investments, Unrealized Losses		(15)	(17)
Debt investments, Recorded Basis		89	87
Cash and cash equivalents		0	0
Short-term Investments		89	87
Equity and other investments		$ 0	$ 0

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