Summary of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period			$ 118,304
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201601Member	us-gaap:AccountingStandardsUpdate201601Member	us-gaap:AccountingStandardsUpdate201601Member	us-gaap:AccountingStandardsUpdate201601Member
Net change related to other comprehensive income (loss)	$ 257	$ (194)	$ 171	$ 85
Balance, end of period	130,236	110,109	130,236	110,109
Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(34)	(2)	(38)	0
Unrealized gains (losses), net of tax	25	2	45	(4)
Tax expense included in provision for income taxes	4	2	8	1
Amounts reclassified from accumulated other comprehensive income (loss)	(17)	(6)	(33)	(2)
Net change related to other comprehensive income (loss)	8	(4)	12	(6)
Balance, end of period	(26)	(6)	(26)	(6)
Derivatives | Revenue
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustments for gains included in earnings	(21)	(8)	(41)	(3)
Investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	5,287	2,065	5,478	1,488
Unrealized gains (losses), net of tax	(477)	(414)	(665)	162
Tax expense included in provision for income taxes	4	1	8	1
Amounts reclassified from accumulated other comprehensive income (loss)	(15)	(6)	(28)	(5)
Net change related to other comprehensive income (loss)	(492)	(420)	(693)	157
Balance, end of period	4,795	1,645	4,795	1,645
Investments | Cumulative effect of accounting changes
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	0	0	10	0
Investments | Other Income (Expense), Net
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustments for gains included in earnings	(19)	(7)	(36)	(6)
Translation adjustments and other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(2,143)	(2,124)	(2,254)	(1,828)
Net change related to other comprehensive income (loss)	741	230	852	(66)
Balance, end of period	(1,402)	(1,894)	(1,402)	(1,894)
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	3,110	(61)	3,186	(340)
Net change related to other comprehensive income (loss)	257	(194)	171	85
Balance, end of period	3,367	(255)	3,367	(255)
Accumulated other comprehensive income (loss) | Cumulative effect of accounting changes
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	$ 0	$ 0	$ 10	$ 0