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Summary of Changes in Accumulated Other Comprehensive Income (Loss) by Component (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period			$ 102,330
Net change related to other comprehensive income (loss)	$ (194)	$ 602	85	$ 241
Balance, end of period	110,109	92,128	110,109	92,128
Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(2)	128	0	173
Unrealized gains (losses), net of tax	2	71	(4)	115
Tax expense (benefit) included in provision for income taxes	2	2	1	5
Amounts reclassified from accumulated other comprehensive income (loss)	(6)	(86)	(2)	(175)
Net change related to other comprehensive income (loss)	(4)	(15)	(6)	(60)
Balance, end of period	(6)	113	(6)	113
Derivatives | Revenue
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustments for (gains) losses	(8)	(88)	(3)	(180)
Investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	2,065	(1,178)	1,488	(850)
Unrealized gains (losses), net of tax	(414)	879	162	556
Tax expense (benefit) included in provision for income taxes	1	0	1	(16)
Amounts reclassified from accumulated other comprehensive income (loss)	(6)	2	(5)	64
Net change related to other comprehensive income (loss)	(420)	881	157	620
Cumulative effect of accounting changes	0	0	0	(67)
Balance, end of period	1,645	(297)	1,645	(297)
Investments | Other Income (Expense), Net
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustments for (gains) losses	(7)	2	(6)	80
Translation adjustments and other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(2,124)	(1,565)	(1,828)	(1,510)
Net change related to other comprehensive income (loss)	230	(264)	(66)	(319)
Balance, end of period	(1,894)	(1,829)	(1,894)	(1,829)
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(61)	(2,615)	(340)	(2,187)
Net change related to other comprehensive income (loss)	(194)	602	85	241
Cumulative effect of accounting changes	0	0	0	(67)
Balance, end of period	$ (255)	$ (2,013)	$ (255)	$ (2,013)

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