| Document and Entity Information | Aug. 31, 2023 |
| Document And Entity Information [Line Items] | |
| Amendment Flag | true |
| Entity Central Index Key | 0001618921 |
| Document Type | 8-K/A |
| Document Period End Date | Aug. 31, 2023 |
| Entity Registrant Name | WALGREENS BOOTS ALLIANCE, INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-36759 |
| Entity Tax Identification Number | 47-1758322 |
| Entity Address, Address Line One | 108 Wilmot Road |
| Entity Address, City or Town | Deerfield |
| Entity Address, State or Province | IL |
| Entity Address, Postal Zip Code | 60015 |
| City Area Code | (847) |
| Local Phone Number | 315-2500 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Amendment Description | On September 1, 2023, Walgreens Boots Alliance, Inc. (the “Company”) filed a Current Report on Form 8-K (the “Original 8-K”) to announce, among other things, that its Board of Directors (the “Board”) and Rosalind Brewer had mutually agreed that Ms. Brewer would step down as the Company’s Chief Executive Officer and as a member of the Board and that the Board had appointed Ginger Graham as the Company’s interim Chief Executive Officer, effective September 1, 2023. This amendment to the Original 8-K (this “Amended 8-K”) amends and supplements the Original 8-K to provide details about Ms. Graham’s salary, compensation and other benefits in connection with her appointment. No other changes have been made to the Original 8-K. |
| Common Stock [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | Common Stock, $0.01 par value |
| Trading Symbol | WBA |
| Security Exchange Name | NASDAQ |
| M 3.600 Walgreens Boots Alliance Inc . Notes Due 2025 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 3.600% Walgreens Boots Alliance, Inc. notes due 2025 |
| Trading Symbol | WBA25 |
| Security Exchange Name | NASDAQ |
| M 2.125 Walgreens Boots Alliance Inc . Notes Due 2026 [Member] | |
| Document And Entity Information [Line Items] | |
| Security 12b Title | 2.125% Walgreens Boots Alliance, Inc. notes due 2026 |
| Trading Symbol | WBA26 |
| Security Exchange Name | NASDAQ |
