Summary of Changes in Accumulated Other Comprehensive Income by Component (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	$ 71,997	$ 80,083
Net current period other comprehensive income (loss)	(1,106)	(985)	$ (1,186)
Balance, end of period	72,394	71,997	80,083
Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	352	590	31
Unrealized gains, net of tax effects	328	351	1,152
Tax expense included in provision for income taxes	9	36	15
Amounts reclassified from accumulated other comprehensive income	(546)	(589)	(593)
Net current period other comprehensive income (loss)	(218)	(238)	559
Balance, end of period	134	352	590
Derivatives | Revenue
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustments for gains	(555)	(625)	(608)
Investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	2,941	3,169	3,531
Unrealized gains, net of tax effects	517	219	110
Tax expense included in provision for income taxes	880	241	256
Amounts reclassified from accumulated other comprehensive income	(1,633)	(447)	(472)
Net current period other comprehensive income (loss)	(1,116)	(228)	(362)
Balance, end of period	1,825	2,941	3,169
Investments | Other income (expense), net
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustments for gains	(2,513)	(688)	(728)
Translation adjustments and other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	(1,756)	(1,237)	146
Net current period other comprehensive income (loss)	228	(519)	(1,383)
Balance, end of period	(1,528)	(1,756)	(1,237)
Accumulated other comprehensive income
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance, beginning of period	1,537	2,522	3,708
Net current period other comprehensive income (loss)	(1,106)	(985)	(1,186)
Balance, end of period	$ 431	$ 1,537	$ 2,522