Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 31,300	$ 20,617	$ 19,558
Other comprehensive income (loss) before reclassification adjustments	(2,731)	(580)	353
Amounts reclassified from accumulated OCI	(266)	305
Tax benefit (provision)	219	(75)	(125)
Net other comprehensive income (loss)	(2,834)	(356)	228
Ending Balance	30,281	31,300	20,617
Pension/Post-retirement Obligations [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	29	15	63
Other comprehensive income (loss) before reclassification adjustments	(303)	23	(77)
Amounts reclassified from accumulated OCI	0	0
Tax benefit (provision)	62	(9)	29
Net other comprehensive income (loss)	(241)	14	(48)
Ending Balance	(212)	29	15
Unrecognized Gain (Loss) on Available-for-Sale Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	259	107	1
Other comprehensive income (loss) before reclassification adjustments	(148)	247	170
Amounts reclassified from accumulated OCI	(268)	0
Tax benefit (provision)	159	(95)	(64)
Net other comprehensive income (loss)	(257)	152	106
Ending Balance	2	259	107
Unrealized Gain (Loss) on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(40)	(27)	0
Other comprehensive income (loss) before reclassification adjustments	0	(14)	(43)
Amounts reclassified from accumulated OCI	5	(5)
Tax benefit (provision)	(2)	6	16
Net other comprehensive income (loss)	3	(13)	(27)
Ending Balance	(37)	(40)	(27)
Share of OCI of Equity Method Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	0	(113)	(95)
Other comprehensive income (loss) before reclassification adjustments	(1)	(57)	(27)
Amounts reclassified from accumulated OCI	0	230
Tax benefit (provision)	0	(60)	9
Net other comprehensive income (loss)	(1)	113	(18)
Ending Balance	(1)	0	(113)
Cumulative Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(462)	154	(61)
Other comprehensive income (loss) before reclassification adjustments	(2,279)	(779)	330
Amounts reclassified from accumulated OCI	(3)	80
Tax benefit (provision)	0	83	(115)
Net other comprehensive income (loss)	(2,282)	(616)	215
Ending Balance	(2,744)	(462)	154
AOCI Total [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(214)	136	(92)
Net other comprehensive income (loss)	(2,778)	(350)	228
Ending Balance	$ (2,992)	$ (214)	$ 136