Supplemental Cash Flow Disclosures (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Feb. 28, 2015	Feb. 28, 2014	Aug. 31, 2014
Supplemental Cash Flow Disclosures [Abstract]
Non-cash transactions for debt assumed	$ 9,000
Non-cash transaction for common stock issued in relation to the second step transaction	11,000us-gaap_StockIssued1
Business Acquisition [Line Items]
Consideration received	212us-gaap_MinorityInterest		104us-gaap_MinorityInterest
Purchase consideration transferred	8,300
Ownership percentage (in hundredths)	45.00%
Fair value of assets acquired	25,800
Liabilities assumed	19,800
Capital lease obligations	282us-gaap_CapitalLeaseObligationsIncurred
Cash paid for interest	90us-gaap_InterestPaid	67us-gaap_InterestPaid
Cash paid for income taxes	553us-gaap_IncomeTaxesPaid	674us-gaap_IncomeTaxesPaid
Walgreens Boots Alliance Development GmbH [Member]
Business Acquisition [Line Items]
Consideration received	$ 2,600

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The increase during the period in capital lease obligations due to entering into new capital leases.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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The amount of cash paid for interest during the period.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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The amount of debt that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The level of ownership or equity interest acquired in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The amount of investments that an Entity acquires in a noncash (or part noncash) acquisition. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The value of an asset or business acquired in a noncash (or part noncash) acquisition. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The total amount of [all] liabilities that an Entity assumes in acquiring a business or in consideration for an asset received in a noncash (or part noncash) acquisition. Noncash is defined as transactions during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The fair value of stock issued in noncash financing activities.

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