Investment Components (Detail) - USD ($) $ in Millions		Sep. 30, 2025	Jun. 30, 2025
Cash Cash Equivalents And Investments [Line Items]
Debt investments, Adjusted Cost Basis		$ 92,401
Debt investments, Recorded Basis		91,940
Derivative, net		1,328	$ 500
Cash and cash equivalents		28,849	30,242
Short-term Investments		73,163	64,323
Equity and other investments		11,465	15,405
Cash, cash equivalents, and investments		113,477	109,970
Equity Securities
Cash Cash Equivalents And Investments [Line Items]
Equity investments, Recorded Basis		8,982	13,718
Cash and cash equivalents		1,209	1,045
Short-term Investments		0	0
Equity and other investments		7,773	12,673
Equity Securities | Other
Cash Cash Equivalents And Investments [Line Items]
Equity investments, Recorded Basis		4,871	9,141
Cash and cash equivalents		0	0
Short-term Investments		0	0
Equity and other investments		4,871	9,141
Equity Securities | Level 1
Cash Cash Equivalents And Investments [Line Items]
Equity investments, Recorded Basis		4,111	4,577
Cash and cash equivalents		1,209	1,045
Short-term Investments		0	0
Equity and other investments		2,902	3,532
Cash
Cash Cash Equivalents And Investments [Line Items]
Cash		11,366	11,711
Cash and cash equivalents		11,366	11,711
Short-term Investments		0	0
Equity and other investments		0	0
Derivatives, net
Cash Cash Equivalents And Investments [Line Items]
Derivative, net	[1]	1,189	282
Cash and cash equivalents	[1]	0	0
Short-term Investments	[1]	7	10
Equity and other investments	[1]	1,182	272
Debt Securities
Cash Cash Equivalents And Investments [Line Items]
Debt investments, Adjusted Cost Basis		92,401	85,589
Debt investments, Unrealized Gains		895	295
Debt investments, Unrealized Losses		(1,356)	(1,625)
Debt investments, Recorded Basis		91,940	84,259
Cash and cash equivalents		16,274	17,486
Short-term Investments		73,156	64,313
Equity and other investments		2,510	2,460
Debt Securities | Commercial Paper | Level 2
Cash Cash Equivalents And Investments [Line Items]
Debt investments, Adjusted Cost Basis		9,044	10,880
Debt investments, Unrealized Gains		0	0
Debt investments, Unrealized Losses		0	0
Debt investments, Recorded Basis		9,044	10,880
Cash and cash equivalents		8,597	9,939
Short-term Investments		447	941
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		4,478	2,653
Debt investments, Unrealized Gains		0	0
Debt investments, Unrealized Losses		0	0
Debt investments, Recorded Basis		4,478	2,653
Cash and cash equivalents		4,434	2,309
Short-term Investments		44	344
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		54,749	52,878
Debt investments, Unrealized Gains		119	71
Debt investments, Unrealized Losses		(1,238)	(1,462)
Debt investments, Recorded Basis		53,630	51,487
Cash and cash equivalents		1,143	4,742
Short-term Investments		52,487	46,745
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		5,584	2,686
Debt investments, Unrealized Gains		0	0
Debt investments, Unrealized Losses		0	0
Debt investments, Recorded Basis		5,584	2,686
Cash and cash equivalents		2,100	496
Short-term Investments		3,484	2,190
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		392	349
Debt investments, Unrealized Gains		13	24
Debt investments, Unrealized Losses		(6)	(9)
Debt investments, Recorded Basis		399	364
Cash and cash equivalents		0	0
Short-term Investments		399	364
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		3,587	2,558
Debt investments, Unrealized Gains		20	10
Debt investments, Unrealized Losses		(23)	(27)
Debt investments, Recorded Basis		3,584	2,541
Cash and cash equivalents		0	0
Short-term Investments		3,584	2,541
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		12,246	10,763
Debt investments, Unrealized Gains		174	124
Debt investments, Unrealized Losses		(70)	(101)
Debt investments, Recorded Basis		12,350	10,786
Cash and cash equivalents		0	0
Short-term Investments		12,350	10,786
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		2,055	2,511
Debt investments, Unrealized Gains		568	65
Debt investments, Unrealized Losses		0	(5)
Debt investments, Recorded Basis		2,623	2,571
Cash and cash equivalents		0	0
Short-term Investments		113	111
Equity and other investments		2,510	2,460
Debt Securities | Municipal securities | Level 2
Cash Cash Equivalents And Investments [Line Items]
Debt investments, Adjusted Cost Basis		162	207
Debt investments, Unrealized Gains		1	1
Debt investments, Unrealized Losses		(5)	(7)
Debt investments, Recorded Basis		158	201
Cash and cash equivalents		0	0
Short-term Investments		158	201
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		(14)	(14)
Debt investments, Recorded Basis		90	90
Cash and cash equivalents		0	0
Short-term Investments		90	90
Equity and other investments		$ 0	$ 0

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