Summary of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	$ 118,304	$ 102,330
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201601Member	us-gaap:AccountingStandardsUpdate201601Member	us-gaap:AccountingStandardsUpdate201601Member
Net change related to other comprehensive income (loss)	$ (1,374)	$ 3,526	$ 1,914
Balance, end of period	141,988	118,304	102,330
Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(38)	0	173
Unrealized gains (losses), net of tax	34	(38)	160
Tax expense (benefit) included in provision for income taxes	(2)	0	(8)
Amounts reclassified from accumulated other comprehensive income (loss)	(15)	0	(333)
Net change related to other comprehensive income (loss)	19	(38)	(173)
Balance, end of period	(19)	(38)	0
Derivatives | Revenue
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustments for (gains) losses included in earnings	(17)	0	(341)
Investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	5,478	1,488	(850)
Unrealized gains (losses), net of tax	(2,216)	3,987	2,331
Tax expense (benefit) included in provision for income taxes	13	(1)	(19)
Amounts reclassified from accumulated other comprehensive income (loss)	(50)	3	74
Net change related to other comprehensive income (loss)	(2,266)	3,990	2,405
Balance, end of period	3,222	5,478	1,488
Investments | Cumulative effect of accounting changes
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	10	0	(67)
Balance, end of period		10	0
Investments | Other Income (Expense), Net
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustments for (gains) losses included in earnings	(63)	4	93
Translation adjustments and other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(2,254)	(1,828)	(1,510)
Net change related to other comprehensive income (loss)	873	(426)	(318)
Balance, end of period	(1,381)	(2,254)	(1,828)
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	3,186	(340)	(2,187)
Net change related to other comprehensive income (loss)	(1,374)	3,526	1,914
Balance, end of period	1,822	3,186	(340)
Accumulated other comprehensive income (loss) | Cumulative effect of accounting changes
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	$ 10	0	(67)
Balance, end of period		$ 10	$ 0