Summary of Changes in Accumulated Other Comprehensive Income by Component (Detail) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	$ 87,711
Net change related to other comprehensive income (loss)	(101)	$ 164
Balance, end of period	89,647	82,462
Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	134	352
Unrealized gains, net of tax effects	4	35
Tax expense included in provision for income taxes	1	3
Amounts reclassified from accumulated other comprehensive income	(110)	(72)
Net change related to other comprehensive income (loss)	(106)	(37)
Balance, end of period	28	315
Derivatives | Revenue
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustments for gains	(111)	(75)
Investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	1,825	2,941
Unrealized gains, net of tax effects	73	339
Tax expense included in provision for income taxes	194	138
Amounts reclassified from accumulated other comprehensive income	(361)	(256)
Net change related to other comprehensive income (loss)	(288)	83
Balance, end of period	1,537	3,024
Investments | Other income (expense), net
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustments for gains	(555)	(394)
Translation Adjustments and Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(1,332)	(1,499)
Net change related to other comprehensive income (loss)	293	118
Balance, end of period	(1,039)	(1,381)
Accumulated other comprehensive income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	627	1,794
Net change related to other comprehensive income (loss)	(101)	164
Balance, end of period	$ 526	$ 1,958