Investment Components (Detail) - USD ($) $ in Millions		Sep. 30, 2019	Jun. 30, 2019
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Cost Basis		$ 129,308
Debt investments, Recorded Basis		131,911
Derivative, net		60	$ 137
Cash and cash equivalents		13,117	11,356
Short-term Investments		123,519	122,463
Equity Investments		2,684	2,649
Cash, cash equivalents, and investments		139,320	136,468
Equity investments
Cash, Cash Equivalents and Investments [Line Items]
Equity investments, Recorded Basis		3,182	3,058
Cash and cash equivalents		498	409
Short-term Investments		0	0
Equity Investments		2,684	2,649
Equity investments | Other
Cash, Cash Equivalents and Investments [Line Items]
Equity investments, Recorded Basis		2,187	2,085
Cash and cash equivalents		0	0
Short-term Investments		0	0
Equity Investments		2,187	2,085
Equity investments | Level 1
Cash, Cash Equivalents and Investments [Line Items]
Equity investments, Recorded Basis		995	973
Cash and cash equivalents		498	409
Short-term Investments		0	0
Equity Investments		497	564
Cash
Cash, Cash Equivalents and Investments [Line Items]
Cash		4,200	3,771
Cash and cash equivalents		4,200	3,771
Short-term Investments		0	0
Equity Investments		0	0
Derivatives, net
Cash, Cash Equivalents and Investments [Line Items]
Derivative, net	[1]	27	(13)
Cash and cash equivalents	[1]	0	0
Short-term Investments	[1]	27	(13)
Equity Investments	[1]	0	0
Debt investments
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Cost Basis		129,308	127,747
Debt investments, Unrealized Gains		2,682	2,027
Debt investments, Unrealized Losses		(79)	(122)
Debt investments, Recorded Basis		131,911	129,652
Cash and cash equivalents		8,419	7,176
Short-term Investments		123,492	122,476
Equity Investments		0	0
Debt investments | Commercial Paper | Level 2
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Cost Basis		4,613	2,211
Debt investments, Unrealized Gains		0	0
Debt investments, Unrealized Losses		0	0
Debt investments, Recorded Basis		4,613	2,211
Cash and cash equivalents		4,339	1,773
Short-term Investments		274	438
Equity Investments		0	0
Debt investments | Certificates of deposit | Level 2
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Cost Basis		1,920	2,018
Debt investments, Unrealized Gains		0	0
Debt investments, Unrealized Losses		0	0
Debt investments, Recorded Basis		1,920	2,018
Cash and cash equivalents		1,134	1,430
Short-term Investments		786	588
Equity Investments		0	0
Debt investments | U.S. government securities | Level 1
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Cost Basis		104,575	104,925
Debt investments, Unrealized Gains		2,483	1,854
Debt investments, Unrealized Losses		(57)	(104)
Debt investments, Recorded Basis		107,001	106,675
Cash and cash equivalents		617	769
Short-term Investments		106,384	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		749	988
Debt investments, Unrealized Gains		0	0
Debt investments, Unrealized Losses		0	0
Debt investments, Recorded Basis		749	988
Cash and cash equivalents		200	698
Short-term Investments		549	290
Equity Investments		0	0
Debt investments | Foreign government bonds | Level 2
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Cost Basis		6,196	6,350
Debt investments, Unrealized Gains		4	4
Debt investments, Unrealized Losses		(11)	(8)
Debt investments, Recorded Basis		6,189	6,346
Cash and cash equivalents		2,129	2,506
Short-term Investments		4,060	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		3,438	3,554
Debt investments, Unrealized Gains		12	10
Debt investments, Unrealized Losses		(2)	(3)
Debt investments, Recorded Basis		3,448	3,561
Cash and cash equivalents		0	0
Short-term Investments		3,448	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		7,550	7,437
Debt investments, Unrealized Gains		128	111
Debt investments, Unrealized Losses		(9)	(7)
Debt investments, Recorded Basis		7,669	7,541
Cash and cash equivalents		0	0
Short-term Investments		7,669	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		13	15
Debt investments, Unrealized Gains		0	0
Debt investments, Unrealized Losses		0	0
Debt investments, Recorded Basis		13	15
Cash and cash equivalents		0	0
Short-term Investments		13	15
Equity Investments		0	0
Debt investments | Municipal securities | Level 2
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Cost Basis		242	242
Debt investments, Unrealized Gains		55	48
Debt investments, Unrealized Losses		0	0
Debt investments, Recorded Basis		297	290
Cash and cash equivalents		0	0
Short-term Investments		297	290
Equity Investments		0	0
Debt investments | Municipal securities | Level 3
Cash, Cash Equivalents and Investments [Line Items]
Debt investments, Cost Basis		12	7
Debt investments, Unrealized Gains		0	0
Debt investments, Unrealized Losses		0	0
Debt investments, Recorded Basis		12	7
Cash and cash equivalents		0	0
Short-term Investments		12	7
Equity Investments		$ 0	$ 0

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