Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2017	Feb. 29, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ 30,281
Net other comprehensive income (loss)	$ 5	$ (1,245)	(860)	$ (1,690)
Ending Balance	30,421		30,421
Pension/post-retirement obligations
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(221)	32	(212)	29
Other comprehensive income (loss) before reclassification adjustments	6	(4)	(5)	(1)
Amounts reclassified from accumulated OCI	0	0	0	0
Tax benefit (provision)	(1)	2	1	2
Net other comprehensive income (loss)	5	(2)	(4)	1
Ending Balance	(216)	30	(216)	30
Unrecognized gain (loss) on available-for-sale investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	1	260	2	259
Other comprehensive income (loss) before reclassification adjustments	0	(139)	(1)	(144)
Amounts reclassified from accumulated OCI	0	0	0	0
Tax benefit (provision)	0	51	0	57
Net other comprehensive income (loss)	0	(88)	(1)	(87)
Ending Balance	1	172	1	172
Unrealized gain (loss) on cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(36)	(39)	(37)	(40)
Other comprehensive income (loss) before reclassification adjustments	0	0	0	0
Amounts reclassified from accumulated OCI	1	2	3	3
Tax benefit (provision)	0	(1)	(1)	(1)
Net other comprehensive income (loss)	1	1	2	2
Ending Balance	(35)	(38)	(35)	(38)
Share of OCI of equity method investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(2)	0	(1)	0
Other comprehensive income (loss) before reclassification adjustments	(7)	0	(8)	0
Amounts reclassified from accumulated OCI	0	0	0	0
Tax benefit (provision)	3	0	3	0
Net other comprehensive income (loss)	(4)	0	(5)	0
Ending Balance	(6)	0	(6)	0
Currency translation adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(3,552)	(911)	(2,744)	(462)
Other comprehensive income (loss) before reclassification adjustments	(1)	(1,121)	(809)	(1,570)
Amounts reclassified from accumulated OCI	0	0	0	0
Tax benefit (provision)	0	0	0	0
Net other comprehensive income (loss)	(1)	(1,121)	(809)	(1,570)
Ending Balance	(3,553)	(2,032)	(3,553)	(2,032)
Total
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(3,810)	(658)	(2,992)	(214)
Other comprehensive income (loss) before reclassification adjustments	(2)	(1,264)	(823)	(1,715)
Amounts reclassified from accumulated OCI	1	2	3	3
Tax benefit (provision)	2	52	3	58
Net other comprehensive income (loss)	1	(1,210)	(817)	(1,654)
Ending Balance	$ (3,809)	$ (1,868)	$ (3,809)	$ (1,868)