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Stock compensation plans	12 Months Ended
Stock compensation plans	Aug. 31, 2021
Share-based Payment Arrangement [Abstract]
Stock compensation plans	Stock compensation plans In fiscal 2021, the Company's Board of Directors approved the Walgreens Boots Alliance, Inc. 2021 Omnibus Incentive Plan (the “2021 Omnibus Plan”). The 2021 Omnibus Plan replicates the Walgreens Boots Alliance, Inc. 2013 Omnibus Incentive Plan and provides incentive compensation to the Company’s non-employee directors, officers and other eligible employees. The Company grants stock options, performance shares and restricted units under the 2021 Omnibus Plan. Performance shares issued under the 2021 Omnibus Plan offer performance-based incentive awards to certain employees. Restricted stock units are also equity-based awards with vesting requirements that are granted to key employees. The performance shares and restricted stock unit awards are both subject to restrictions as to continuous employment except in the case of death, normal retirement or total and permanent disability. Total stock-based compensation expense for fiscal 2021, 2020 and 2019 was $155 million, $137 million and $119 million, respectively. Unrecognized compensation cost related to non-vested awards at August 31, 2021 was $151 million, which will be fully recognized over the next three years.