Supplemental Guarantor Condensed Consolidating Financial Information, Balance Sheets (Unaudited) (Details) (USD $) In Millions, unless otherwise specified	Feb. 28, 2015		Aug. 31, 2014		Feb. 28, 2014	Aug. 31, 2013
Current Assets:
Cash and cash equivalents	$ 3,005		$ 2,646		$ 1,777	$ 2,106
Accounts receivable, net	7,017		3,218
Inventories	9,379		6,076
Current intercompany loan receivable	0		0
Other current assets	1,314		302
Total Current Assets	20,715		12,242
Non-Current Assets:
Property, plant and equipment, at cost, less accumulated depreciation and amortization	15,646		12,257
Equity investment in Alliance Boots	0		7,336
Goodwill	17,044		2,359
Intangible assets	12,225		1,180
Other non-current assets	5,727		1,896
Non-current intercompany loan receivable	0		0
Investment in subsidiaries	0		0
Total Non-Current Assets	50,642		25,028
Total Assets	71,357		37,270
Current Liabilities:
Short-term borrowings	1,061		774
Trade accounts payable	10,293		4,315
Current intercompany loan payable	0		0
Accrued expenses and other liabilities	5,140		3,701
Income taxes	196		105
Total Current Liabilities	16,690		8,895
Non-Current Liabilities:
Long-term debt	16,001	[1]	3,736	[1]
Deferred income taxes	3,689		1,080
Non-current intercompany loan payable	0		0
Other non-current liabilities	3,951		2,942
Total Non-Current Liabilities	23,641		7,758
Equity:
Total Walgreens Boots Alliance, Inc. Shareholders' Equity	30,814		20,513
Noncontrolling interests	212		104
Total Equity	31,026		20,617
Total Liabilities and Equity	71,357		37,270
Guarantor/Issuer Subsidiary [Member]
Current Assets:
Cash and cash equivalents	1,840		2,224		1,449	1,771
Accounts receivable, net	2,027		1,860
Inventories	4,396		4,301
Current intercompany loan receivable	12,930		6,755
Other current assets	533		176
Total Current Assets	21,726		15,316
Non-Current Assets:
Property, plant and equipment, at cost, less accumulated depreciation and amortization	6,500		6,932
Equity investment in Alliance Boots	0		0
Goodwill	8,382		343
Intangible assets	286		417
Other non-current assets	162		252
Non-current intercompany loan receivable	0		0
Investment in subsidiaries	32,379		23,250
Total Non-Current Assets	47,709		31,194
Total Assets	69,435		46,510
Current Liabilities:
Short-term borrowings	757		766
Trade accounts payable	4,355		3,850
Current intercompany loan payable	12,258		8,277
Accrued expenses and other liabilities	2,508		3,044
Income taxes	0		0
Total Current Liabilities	19,878		15,937
Non-Current Liabilities:
Long-term debt	3,737		3,726
Deferred income taxes	283		404
Non-current intercompany loan payable	15,983		3,560
Other non-current liabilities	2,515		2,370
Total Non-Current Liabilities	22,518		10,060
Equity:
Total Walgreens Boots Alliance, Inc. Shareholders' Equity	27,039		20,513
Noncontrolling interests	0		0
Total Equity	27,039		20,513
Total Liabilities and Equity	69,435		46,510
Non-guarantor Subsidiaries [Member]
Current Assets:
Cash and cash equivalents	1,165		422		328	335
Accounts receivable, net	4,990		1,358
Inventories	4,983		1,755
Current intercompany loan receivable	26,428		8,277
Other current assets	1,005		141
Total Current Assets	38,571		11,973
Non-Current Assets:
Property, plant and equipment, at cost, less accumulated depreciation and amortization	9,146		5,325
Equity investment in Alliance Boots	0		7,336
Goodwill	8,662		2,016
Intangible assets	11,939		763
Other non-current assets	5,561		1,644
Non-current intercompany loan receivable	3,725		3,560
Investment in subsidiaries	0		0
Total Non-Current Assets	39,033		20,644
Total Assets	77,604		32,617
Current Liabilities:
Short-term borrowings	304		8
Trade accounts payable	5,938		465
Current intercompany loan payable	24,604		6,755
Accrued expenses and other liabilities	2,153		657
Income taxes	225		120
Total Current Liabilities	33,224		8,005
Non-Current Liabilities:
Long-term debt	128		10
Deferred income taxes	3,406		676
Non-current intercompany loan payable	6,855		0
Other non-current liabilities	1,400		572
Total Non-Current Liabilities	11,789		1,258
Equity:
Total Walgreens Boots Alliance, Inc. Shareholders' Equity	32,379		23,250
Noncontrolling interests	212		104
Total Equity	32,591		23,354
Total Liabilities and Equity	77,604		32,617
Parent Company [Member]
Current Assets:
Cash and cash equivalents	0		0		0	0
Accounts receivable, net	0		0
Inventories	0		0
Current intercompany loan receivable	20,720		0
Other current assets	11		0
Total Current Assets	20,731		0
Non-Current Assets:
Property, plant and equipment, at cost, less accumulated depreciation and amortization	0		0
Equity investment in Alliance Boots	0		0
Goodwill	0		0
Intangible assets	0		0
Other non-current assets	4		0
Non-current intercompany loan receivable	19,113		0
Investment in subsidiaries	27,039		0
Total Non-Current Assets	46,156		0
Total Assets	66,887		0
Current Liabilities:
Short-term borrowings	0		0
Trade accounts payable	0		0
Current intercompany loan payable	23,216		0
Accrued expenses and other liabilities	479		0
Income taxes	206		0
Total Current Liabilities	23,901		0
Non-Current Liabilities:
Long-term debt	12,136		0
Deferred income taxes	0		0
Non-current intercompany loan payable	0		0
Other non-current liabilities	36		0
Total Non-Current Liabilities	12,172		0
Equity:
Total Walgreens Boots Alliance, Inc. Shareholders' Equity	30,814		0
Noncontrolling interests	0		0
Total Equity	30,814		0
Total Liabilities and Equity	66,887		0
Consolidating Adjustments [Member]
Current Assets:
Cash and cash equivalents	0		0		0	0
Accounts receivable, net	0		0
Inventories	0		0
Current intercompany loan receivable	(60,078)		(15,032)
Other current assets	(235)		(15)
Total Current Assets	(60,313)		(15,047)
Non-Current Assets:
Property, plant and equipment, at cost, less accumulated depreciation and amortization	0		0
Equity investment in Alliance Boots	0		0
Goodwill	0		0
Intangible assets	0		0
Other non-current assets	0		0
Non-current intercompany loan receivable	(22,838)		(3,560)
Investment in subsidiaries	(59,418)		(23,250)
Total Non-Current Assets	(82,256)		(26,810)
Total Assets	(142,569)		(41,857)
Current Liabilities:
Short-term borrowings	0		0
Trade accounts payable	0		0
Current intercompany loan payable	(60,078)		(15,032)
Accrued expenses and other liabilities	0		0
Income taxes	(235)		(15)
Total Current Liabilities	(60,313)		(15,047)
Non-Current Liabilities:
Long-term debt	0		0
Deferred income taxes	0		0
Non-current intercompany loan payable	(22,838)		(3,560)
Other non-current liabilities	0		0
Total Non-Current Liabilities	(22,838)		(3,560)
Equity:
Total Walgreens Boots Alliance, Inc. Shareholders' Equity	(59,418)		(23,250)
Noncontrolling interests	0		0
Total Equity	(59,418)		(23,250)
Total Liabilities and Equity	$ (142,569)		$ (41,857)

[1] All notes are presented net of unamortized discount, where applicable.