Investment Components (Detail) - USD ($) $ in Millions		Mar. 31, 2020	Jun. 30, 2019
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Cost Basis		$ 125,311
Debt investments, Recorded Basis		131,820
Derivative, net		284	$ 137
Cash and cash equivalents		11,710	11,356
Short-term Investments		125,916	122,463
Equity Investments		2,660	2,649
Cash, cash equivalents, and investments		140,286	136,468
Equity investments
Cash, Cash Equivalents and Investments [Line Items]
Equity investments, Recorded Basis		3,899	3,058
Cash and cash equivalents		1,239	409
Short-term Investments		0	0
Equity Investments		2,660	2,649
Equity investments | Other
Cash, Cash Equivalents and Investments [Line Items]
Equity investments, Recorded Basis		2,473	2,085
Cash and cash equivalents		0	0
Short-term Investments		0	0
Equity Investments		2,473	2,085
Equity investments | Level 1
Cash, Cash Equivalents and Investments [Line Items]
Equity investments, Recorded Basis		1,426	973
Cash and cash equivalents		1,239	409
Short-term Investments		0	0
Equity Investments		187	564
Cash
Cash, Cash Equivalents and Investments [Line Items]
Cash		4,583	3,771
Cash and cash equivalents		4,583	3,771
Short-term Investments		0	0
Equity Investments		0	0
Derivatives, net
Cash, Cash Equivalents and Investments [Line Items]
Derivative, net	[1]	(16)	(13)
Cash and cash equivalents	[1]	0	0
Short-term Investments	[1]	(16)	(13)
Equity Investments	[1]	0	0
Debt investments
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Cost Basis		125,311	127,747
Debt investments, Unrealized Gains		6,715	2,027
Debt investments, Unrealized Losses		(206)	(122)
Debt investments, Recorded Basis		131,820	129,652
Cash and cash equivalents		5,888	7,176
Short-term Investments		125,932	122,476
Equity Investments		0	0
Debt investments | Commercial Paper | Level 2
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Cost Basis		5,164	2,211
Debt investments, Unrealized Gains		0	0
Debt investments, Unrealized Losses		0	0
Debt investments, Recorded Basis		5,164	2,211
Cash and cash equivalents		1,442	1,773
Short-term Investments		3,722	438
Equity Investments		0	0
Debt investments | Certificates of deposit | Level 2
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Cost Basis		2,446	2,018
Debt investments, Unrealized Gains		0	0
Debt investments, Unrealized Losses		0	0
Debt investments, Recorded Basis		2,446	2,018
Cash and cash equivalents		1,984	1,430
Short-term Investments		462	588
Equity Investments		0	0
Debt investments | U.S. government securities | Level 1
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Cost Basis		96,481	104,925
Debt investments, Unrealized Gains		6,543	1,854
Debt investments, Unrealized Losses		(13)	(104)
Debt investments, Recorded Basis		103,011	106,675
Cash and cash equivalents		496	769
Short-term Investments		102,515	105,906
Equity Investments		0	0
Debt investments | U.S. agency securities | Level 2
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Cost Basis		2,124	988
Debt investments, Unrealized Gains		0	0
Debt investments, Unrealized Losses		0	0
Debt investments, Recorded Basis		2,124	988
Cash and cash equivalents		458	698
Short-term Investments		1,666	290
Equity Investments		0	0
Debt investments | Foreign government bonds | Level 2
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Cost Basis		7,255	6,350
Debt investments, Unrealized Gains		3	4
Debt investments, Unrealized Losses		(13)	(8)
Debt investments, Recorded Basis		7,245	6,346
Cash and cash equivalents		1,476	2,506
Short-term Investments		5,769	3,840
Equity Investments		0	0
Debt investments | Mortgage- and asset-backed securities | Level 2
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Cost Basis		3,952	3,554
Debt investments, Unrealized Gains		16	10
Debt investments, Unrealized Losses		(37)	(3)
Debt investments, Recorded Basis		3,931	3,561
Cash and cash equivalents		0	0
Short-term Investments		3,931	3,561
Equity Investments		0	0
Debt investments | Corporate notes and bonds | Level 2
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Cost Basis		7,444	7,437
Debt investments, Unrealized Gains		107	111
Debt investments, Unrealized Losses		(138)	(7)
Debt investments, Recorded Basis		7,413	7,541
Cash and cash equivalents		32	0
Short-term Investments		7,381	7,541
Equity Investments		0	0
Debt investments | Corporate notes and bonds | Level 3
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Cost Basis		49	15
Debt investments, Unrealized Gains		0	0
Debt investments, Unrealized Losses		0	0
Debt investments, Recorded Basis		49	15
Cash and cash equivalents		0	0
Short-term Investments		49	15
Equity Investments		0	0
Debt investments | Municipal securities | Level 2
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Cost Basis		312	242
Debt investments, Unrealized Gains		46	48
Debt investments, Unrealized Losses		(5)	0
Debt investments, Recorded Basis		353	290
Cash and cash equivalents		0	0
Short-term Investments		353	290
Equity Investments		0	0
Debt investments | Municipal securities | Level 3
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Cost Basis		84	7
Debt investments, Unrealized Gains		0	0
Debt investments, Unrealized Losses		0	0
Debt investments, Recorded Basis		84	7
Cash and cash equivalents		0	0
Short-term Investments		84	7
Equity Investments		$ 0	$ 0

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