Summary of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period			$ 141,988
Accounting Standards Update [Extensible Enumeration]	us-gaap:AccountingStandardsUpdate201601Member	us-gaap:AccountingStandardsUpdate201601Member	us-gaap:AccountingStandardsUpdate201601Member	us-gaap:AccountingStandardsUpdate201601Member
Other comprehensive income (loss)	$ (2,913)	$ (1,905)	$ (4,298)	$ (1,734)
Balance, end of period	162,924	134,505	162,924	134,505
Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(17)	(26)	(19)	(38)
Unrealized gains (losses), net of tax	(6)	(2)	(27)	43
Tax expense (benefit) included in provision for income taxes	(3)	(6)	(9)	2
Amounts reclassified from accumulated other comprehensive income (loss)	12	20	35	(13)
Other comprehensive income (loss)	6	18	8	30
Balance, end of period	(11)	(8)	(11)	(8)
Derivatives | Other Income (Expense), Net
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustments for (gains) losses included in other income (expense), net	15	26	44	(15)
Investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	2,057	4,795	3,222	5,478
Unrealized gains (losses), net of tax	(2,894)	(1,696)	(4,051)	(2,361)
Tax expense (benefit) included in provision for income taxes	(3)	2	(1)	10
Amounts reclassified from accumulated other comprehensive income (loss)	12	(9)	4	(37)
Other comprehensive income (loss)	(2,882)	(1,705)	(4,047)	(2,398)
Balance, end of period	(825)	3,090	(825)	3,090
Investments | Cumulative effect of accounting changes
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	0	0	0	10
Investments | Other Income (Expense), Net
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustments for (gains) losses included in other income (expense), net	15	(11)	5	(47)
Translation adjustments and other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(1,603)	(1,402)	(1,381)	(2,254)
Other comprehensive income (loss)	(37)	(218)	(259)	634
Balance, end of period	(1,640)	(1,620)	(1,640)	(1,620)
Accumulated other comprehensive income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	437	3,367	1,822	3,186
Other comprehensive income (loss)	(2,913)	(1,905)	(4,298)	(1,734)
Balance, end of period	(2,476)	1,462	(2,476)	1,462
Accumulated other comprehensive income | Cumulative effect of accounting changes
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	$ 0	$ 0	$ 0	$ 10