Supplemental Guarantor Condensed Consolidating Financial Information (Details) - May. 31, 2015 € in Millions, £ in Millions, $ in Millions		USD ($)	GBP (£)	EUR (€)
Debt Instrument [Line Items]
Maximum aggregate outstanding amount of indebtedness		$ 2,000
Notes Due 2019 [Member]
Debt Instrument [Line Items]
Stated interest rate (in hundredths)		2.70%	2.70%	2.70%
Notes Due 2021 [Member]
Debt Instrument [Line Items]
Stated interest rate (in hundredths)	[1]	3.30%	3.30%	3.30%
Notes Due 2024 [Member]
Debt Instrument [Line Items]
Stated interest rate (in hundredths)	[1]	3.80%	3.80%	3.80%
Notes Due 2034 [Member]
Debt Instrument [Line Items]
Stated interest rate (in hundredths)	[1]	4.50%	4.50%	4.50%
Notes Due 2044 [Member]
Debt Instrument [Line Items]
Stated interest rate (in hundredths)	[1]	4.80%	4.80%	4.80%
Notes Due 2026 [Member]
Debt Instrument [Line Items]
Stated interest rate (in hundredths)	[1],[2]	2.125%	2.125%	2.125%
Notes Due 2020 [Member]
Debt Instrument [Line Items]
Stated interest rate (in hundredths)	[1],[3]	2.875%	2.875%	2.875%
Notes Due 2025 [Member]
Debt Instrument [Line Items]
Stated interest rate (in hundredths)	[1],[3]	3.60%	3.60%	3.60%
Walgreens Boots Alliance [Member]
Debt Instrument [Line Items]
Increased ownership percentage of Alliance Boots (in hundredths)		100.00%	100.00%	100.00%
Maximum aggregate outstanding amount of indebtedness		$ 2,000
Face amount of notes issued		8,000	£ 700
Walgreens Boots Alliance [Member] | Notes Due 2016 [Member]
Debt Instrument [Line Items]
Face amount of notes issued		$ 750
Maturity date of note		May 18, 2016
Basis spread on variable rate (in hundredths)		0.045%
Debt instrument, description of variable rate basis		three-month U.S. dollar LIBOR, reset quarterly
Walgreens Boots Alliance [Member] | Notes Due 2017 [Member]
Debt Instrument [Line Items]
Face amount of notes issued		$ 750
Maturity date of note		Nov. 17, 2017
Stated interest rate (in hundredths)		1.75%	1.75%	1.75%
Walgreens Boots Alliance [Member] | Notes Due 2019 [Member]
Debt Instrument [Line Items]
Face amount of notes issued		$ 1,250
Maturity date of note		Nov. 18, 2019
Stated interest rate (in hundredths)		2.70%	2.70%	2.70%
Walgreens Boots Alliance [Member] | Notes Due 2021 [Member]
Debt Instrument [Line Items]
Face amount of notes issued		$ 1,250
Maturity date of note		Nov. 18, 2021
Stated interest rate (in hundredths)		3.30%	3.30%	3.30%
Walgreens Boots Alliance [Member] | Notes Due 2024 [Member]
Debt Instrument [Line Items]
Face amount of notes issued		$ 2,000
Maturity date of note		Nov. 18, 2024
Stated interest rate (in hundredths)		3.80%	3.80%	3.80%
Walgreens Boots Alliance [Member] | Notes Due 2034 [Member]
Debt Instrument [Line Items]
Face amount of notes issued		$ 500
Maturity date of note		Nov. 18, 2034
Stated interest rate (in hundredths)		4.50%	4.50%	4.50%
Walgreens Boots Alliance [Member] | Notes Due 2044 [Member]
Debt Instrument [Line Items]
Face amount of notes issued		$ 1,500
Maturity date of note		Nov. 18, 2044
Stated interest rate (in hundredths)		4.80%	4.80%	4.80%
Walgreens Boots Alliance [Member] | Notes Due 2026 [Member]
Debt Instrument [Line Items]
Face amount of notes issued | €				€ 750
Maturity date of note		Nov. 20, 2026
Stated interest rate (in hundredths)		2.125%	2.125%	2.125%
Walgreens Boots Alliance [Member] | Notes Due 2020 [Member]
Debt Instrument [Line Items]
Face amount of notes issued | £			£ 400
Maturity date of note		Nov. 20, 2020
Stated interest rate (in hundredths)		2.875%	2.875%	2.875%
Walgreens Boots Alliance [Member] | Notes Due 2025 [Member]
Debt Instrument [Line Items]
Face amount of notes issued | £			£ 300
Maturity date of note		Nov. 20, 2025
Stated interest rate (in hundredths)		3.60%	3.60%	3.60%

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

[2] Euro denominated notes are translated at the May 31, 2015 spot rate of $1.10 to one Euro.

[3] Pound Sterling denominated notes are translated at the May 31, 2015 spot rate of $1.53 to one British Pound Sterling.