| Document and Entity Information | Jan. 03, 2023 |
| Document And Entity Information [Line Items] | |
| Document Type | 8-K/A |
| Amendment Flag | true |
| Document Period End Date | Jan. 03, 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 January 5, 2023, Walgreens Boots Alliance, Inc. (the “Company”) filed a Current Report on Form 8-K (the “Original 8-K”) to report, among other things, that Village Practice Management Company Holdings, LLC (“VillageMD”), of which a majority of the outstanding equity interests on a fully diluted basis are beneficially owned by the Company, completed its previously announced acquisition (the “Summit Health-CityMD Acquisition”) of WP CityMD Topco LLC (“Summit Health-CityMD”) on January 3, 2023.This amendment to the Original Form 8-K (this “Amended 8-K”) amends and supplements the Original 8-K to provide the historical financial information of Summit Health-CityMD and unaudited pro forma condensed combined financial information reflecting the acquisition of Summit Health-CityMD by VillageMD required pursuant to Items 9.01(a) and 9.01(b) of Form 8-K, respectively. In accordance with the requirements of Items 9.01(a)(3) and 9.01(b)(2) of Form 8-K, this Amended 8-K is being filed within 71 calendar days of the date that the Original 8-K was required to be filed with respect to the above referenced transaction. No other changes have been made to the Original 8-K.To facilitate the comparison of the Company’s unaudited pro forma condensed combined financial information with the historical results of Summit Health-CityMD, the Company will furnish a supplementary Form 8-K on March 21, 2023 which presents certain non-GAAP measures of Summit Health-CityMD. These non-GAAP measures of Summit Health-CityMD are presented along with the corresponding reconciliations to the most comparable GAAP measures. |
| Entity Central Index Key | 0001618921 |
| 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 |
| 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 |
| 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 |
