Short-Term Borrowings and Long-Term Debt, Debt Issuance (Details) € in Millions, £ in Millions, $ in Millions		12 Months Ended
		Aug. 31, 2015 USD ($)	Aug. 31, 2015 GBP (£)	Aug. 31, 2015 EUR (€)	Aug. 31, 2014 USD ($)
1.750% Unsecured Notes due 2017 [Member]
Debt Instrument [Line Items]
Interest rate	[1],[2]	1.75%	1.75%	1.75%
3.300% Unsecured Notes Due 2021 [Member]
Debt Instrument [Line Items]
Interest rate	[1]	3.30%	3.30%	3.30%
3.800% Unsecured Notes Due 2024 [Member]
Debt Instrument [Line Items]
Interest rate	[1],[3]	3.80%	3.80%	3.80%
4.500% Unsecured Notes Due 2034 [Member]
Debt Instrument [Line Items]
Interest rate	[1]	4.50%	4.50%	4.50%
4.800% Unsecured Notes Due 2044 [Member]
Debt Instrument [Line Items]
Interest rate	[1]	4.80%	4.80%	4.80%
3.100% Unsecured Notes Due 2022 [Member]
Debt Instrument [Line Items]
Interest rate	[1]	3.10%	3.10%	3.10%
4.400% Unsecured Notes Due 2042 [Member]
Debt Instrument [Line Items]
Interest rate	[1]	4.40%	4.40%	4.40%
Unsecured Debt [Member]
Debt Instrument [Line Items]
Face amount of notes issued					$ 3,500
Unsecured Debt [Member] | Unsecured Variable Rate Notes Due 2016 [Member]
Debt Instrument [Line Items]
Face amount of notes issued		$ 750
Maturity date		May 18, 2016
Interest payment dates		February 18, May 18, August 18, and November 18; commencing on February 18, 2015
Debt instrument, description of variable rate basis		Three-month U.S. Dollar LIBOR
Basis spread on variable rate		0.45%
Unsecured Debt [Member] | 1.750% Unsecured Notes due 2017 [Member]
Debt Instrument [Line Items]
Face amount of notes issued		$ 750
Maturity date		Nov. 17, 2017
Interest payment dates		May 17 and November 17; commencing on May 17, 2015
Interest rate		1.75%	1.75%	1.75%
Unsecured Debt [Member] | 2.700% Unsecured Notes Due 2019 [Member]
Debt Instrument [Line Items]
Face amount of notes issued		$ 1,250
Maturity date		Nov. 18, 2019
Interest payment dates		May 18 and November 18; commencing on May 18, 2015
Interest rate		2.70%	2.70%	2.70%
Unsecured Debt [Member] | 3.300% Unsecured Notes Due 2021 [Member]
Debt Instrument [Line Items]
Face amount of notes issued		$ 1,250
Maturity date		Nov. 18, 2021
Interest payment dates		May 18 and November 18; commencing on May 18, 2015
Interest rate		3.30%	3.30%	3.30%
Unsecured Debt [Member] | 3.800% Unsecured Notes Due 2024 [Member]
Debt Instrument [Line Items]
Face amount of notes issued		$ 2,000
Maturity date		Nov. 18, 2024
Interest payment dates		May 18 and November 18; commencing on May 18, 2015
Interest rate		3.80%	3.80%	3.80%
Unsecured Debt [Member] | 4.500% Unsecured Notes Due 2034 [Member]
Debt Instrument [Line Items]
Face amount of notes issued		$ 500
Maturity date		Nov. 18, 2034
Interest payment dates		May 18 and November 18; commencing on May 18, 2015
Interest rate		4.50%	4.50%	4.50%
Unsecured Debt [Member] | 4.800% Unsecured Notes Due 2044 [Member]
Debt Instrument [Line Items]
Face amount of notes issued		$ 1,500
Maturity date		Nov. 18, 2044
Interest payment dates		May 18 and November 18; commencing on May 18, 2015
Interest rate		4.80%	4.80%	4.80%
Unsecured Debt [Member] | Total $8.0 Billion Debt Issuance [Member]
Debt Instrument [Line Items]
Face amount of notes issued		$ 8,000
Unsecured Debt [Member] | 2.125% Unsecured Euro Notes Due 2026 [Member]
Debt Instrument [Line Items]
Face amount of notes issued | €				€ 750
Maturity date		Nov. 20, 2026
Interest rate		2.125%	2.125%	2.125%
Unsecured Debt [Member] | 2.875% Unsecured Pound Sterling Notes Due 2020 [Member]
Debt Instrument [Line Items]
Face amount of notes issued | £			£ 400
Maturity date		Nov. 20, 2020
Interest rate		2.875%	2.875%	2.875%
Unsecured Debt [Member] | 3.600% Unsecured Pound Sterling Notes Due 2025 [Member]
Debt Instrument [Line Items]
Face amount of notes issued | £			£ 300
Maturity date		Nov. 20, 2025
Interest rate		3.60%	3.60%	3.60%
Unsecured Debt [Member] | Pound Sterling Notes [Member]
Debt Instrument [Line Items]
Face amount of notes issued | £			£ 700
Unsecured Debt [Member] | 3.100% Unsecured Notes Due 2022 [Member]
Debt Instrument [Line Items]
Face amount of notes issued		$ 1,200
Maturity date		Sep. 15, 2022
Interest payment dates		March 15 and September 15; commencing on March 15, 2013
Interest rate		3.10%	3.10%	3.10%
Unsecured Debt [Member] | 4.400% Unsecured Notes Due 2042 [Member]
Debt Instrument [Line Items]
Face amount of notes issued		$ 500
Maturity date		Sep. 15, 2042
Interest payment dates		March 15 and September 15; commencing on March 15, 2013
Interest rate		4.40%	4.40%	4.40%
Unsecured Debt [Member] | Total $4.0 Billion Debt Issuance [Member]
Debt Instrument [Line Items]
Face amount of notes issued		$ 1,700

[1] All notes are presented net of unamortized discount and debt issuance costs, where applicable.

[2] Also includes interest rate swap fair market value adjustments, see Note 12, Fair Value Measurements for additional fair value disclosures.

[3] Pound Sterling denominated notes are translated at the August 31, 2015 spot rate of $1.54 to one British Pound Sterling.