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Stock compensation plans	12 Months Ended
Stock compensation plans	Aug. 31, 2020
Share-based Payment Arrangement [Abstract]
Stock compensation plans	Stock compensation plans The Walgreens Boots Alliance, Inc. 2013 Omnibus Incentive Plan (the “Omnibus Plan”), which became effective in fiscal 2013, provides for incentive compensation to the Company’s non-employee directors, officers and employees and consolidates several previously existing equity compensation plans into a single plan. The Company grants stock options, performance shares and restricted units under the Omnibus Plan. Performance shares issued under the 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 2020, 2019 and 2018 was $137 million, $119 million and $130 million, respectively. Unrecognized compensation cost related to non-vested awards at August 31, 2020 was $188 million, which will be fully recognized over the next three years.