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Stock compensation plans
 12 Months Ended
Aug. 31, 2022
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 equity 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. Stock-based compensation expense associated with such plans for fiscal 2022, 2021 and 2020 was $133 million, $155 million and $137 million, respectively.

Certain majority-owned subsidiaries within the U.S. Healthcare segment maintain standalone stock-based compensation plans. Stock-based compensation expense associated with such plans for fiscal 2022 was $269 million, including the impact of fair value adjustments resulting from acquisitions. Awards granted under standalone stock-based compensation plans include subsidiary units, profits interests, and options. Awards generally vest over time or subject to achievement of certain subsidiary performance targets. Certain awards accelerate vesting upon a change in control or upon the Company’s acquisition of additional subsidiary equity above a certain threshold.
Unrecognized compensation cost related to non-vested awards, inclusive of awards issued under the 2021 Omnibus Plan and the standalone subsidiary stock compensation plans, was $399 million at August 31, 2022, which will be fully recognized over the next three years.