Summary of Changes in Accumulated Other Comprehensive Income by Component (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period			$ 71,997
Net current period other comprehensive income (loss)	$ 132	$ 67	(893)	$ (682)
Balance, end of period	69,729	74,806	69,729	74,806
Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	595	598	352	590
Unrealized gains (losses), net of tax effects	(60)	(125)	424	158
Tax expense included in provision for income taxes	2	11	8	26
Amounts reclassified from accumulated other comprehensive income	(165)	(160)	(406)	(435)
Net current period other comprehensive income (loss)	(225)	(285)	18	(277)
Balance, end of period	370	313	370	313
Derivatives | Revenue
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustments for gains	(167)	(171)	(414)	(461)
Investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	2,030	2,758	2,941	3,169
Unrealized gains (losses), net of tax effects	571	402	367	64
Tax expense included in provision for income taxes	273	31	654	70
Amounts reclassified from accumulated other comprehensive income	(506)	(57)	(1,213)	(130)
Net current period other comprehensive income (loss)	65	345	(846)	(66)
Balance, end of period	2,095	3,103	2,095	3,103
Investments | Other income (expense), net
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustments for gains	(779)	(88)	(1,867)	(200)
Translation adjustments and other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(2,113)	(1,583)	(1,756)	(1,237)
Net current period other comprehensive income (loss)	292	7	(65)	(339)
Balance, end of period	(1,821)	(1,576)	(1,821)	(1,576)
Accumulated other comprehensive income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	512	1,773	1,537	2,522
Net current period other comprehensive income (loss)	132	67	(893)	(682)
Balance, end of period	$ 644	$ 1,840	$ 644	$ 1,840