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Summary of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period			$ 102,330
Net change related to other comprehensive income (loss)	$ 2,931	$ 748	3,016	$ 989
Balance, end of period	114,501	94,864	114,501	94,864
Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(6)	113	0	173
Unrealized gains (losses), net of tax	(46)	31	(50)	146
Tax expense (benefit) included in provision for income taxes	(2)	2	(1)	7
Amounts reclassified from accumulated other comprehensive income (loss)	10	(64)	8	(239)
Net change related to other comprehensive income (loss)	(36)	(33)	(42)	(93)
Balance, end of period	(42)	80	(42)	80
Derivatives | Revenue
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustments for (gains) losses	12	(66)	9	(246)
Investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	1,645	(297)	1,488	(850)
Unrealized gains (losses), net of tax	3,504	711	3,666	1,267
Tax expense (benefit) included in provision for income taxes	(1)	(1)	0	(17)
Amounts reclassified from accumulated other comprehensive income (loss)	4	3	(1)	67
Net change related to other comprehensive income (loss)	3,508	714	3,665	1,334
Cumulative effect of accounting changes	0	0	0	(67)
Balance, end of period	5,153	417	5,153	417
Investments | Other Income (Expense), Net
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustments for (gains) losses	5	4	(1)	84
Translation adjustments and other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(1,894)	(1,829)	(1,828)	(1,510)
Net change related to other comprehensive income (loss)	(541)	67	(607)	(252)
Balance, end of period	(2,435)	(1,762)	(2,435)	(1,762)
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(255)	(2,013)	(340)	(2,187)
Net change related to other comprehensive income (loss)	2,931	748	3,016	989
Cumulative effect of accounting changes	0	0	0	(67)
Balance, end of period	$ 2,676	$ (1,265)	$ 2,676	$ (1,265)

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