POWER OF ATTORNEY

     Know all by these presents, that, effective as of  January 29, 2020, the
undersigned hereby constitutes and appoints each of: Marco Pagni, Joseph B.
Amsbary, Jr., Craig Garvey, and Kelsey Chin, respectively, signing singly, the
undersigned's true and lawful attorney-in-fact, with full power of substitution
and resubstitution, to:

     (1)     prepare, execute in the undersigned's name and on the undersigned's
             behalf, and submit to the U.S. Securities and Exchange Commission
             (the "SEC") a Form ID, including amendments thereto, and any other
             documents necessary or appropriate to obtain and renew codes and
             passwords enabling the undersigned to make electronic filings with
             the SEC of reports required by Section 16(a) of the Securities
             Exchange Act of 1934 or any rule or regulation of the SEC;

     (2)     execute for and on behalf of the undersigned, in the undersigned's
             capacity as an officer and/or member of the Board of Directors of
             Walgreens Boots Alliance, Inc. (the "Company"), Forms 3, 4, and 5
             in accordance with Section 16(a) of the Securities Exchange Act of
             1934 and the rules and regulations thereunder;

     (3)     do and perform any and all acts for and on behalf of the
             undersigned which may be necessary or desirable to complete and
             execute any such Form 3, 4, or 5, complete and execute any
             amendment or amendments thereto, and file such form with the SEC
             and any stock exchange or similar authority; and

     (4)     take any other action of any type whatsoever in connection with the
             foregoing which, in the opinion of such attorney-in-fact, may be of
             benefit to, in the best interest of, or legally required by, the
             undersigned, it being understood that the documents executed by
             such attorney-in-fact on behalf of the undersigned pursuant to this
             Power of Attorney shall be in such form and shall contain such
             terms and conditions as such attorney-in-fact may approve in such
             attorney-in-fact's discretion.

     The undersigned hereby grants to each such attorney-in-fact full power and
authority to do and perform any and every act and thing whatsoever requisite,
necessary, or proper to be done in the exercise of any of the rights and powers
herein granted, as fully to all intents and purposes as the undersigned might or
could do if personally present, with full power of substitution or revocation,
hereby ratifying and confirming all that such attorney-in-fact, or such
attorney-in-fact's substitute or substitutes, shall lawfully do or cause to be
done by virtue of this Power of Attorney and the rights and powers herein
granted.  The undersigned acknowledges that the foregoing attorneys-in-fact, in
serving in such capacity at the request of the undersigned, are not assuming,
nor is the Company assuming, any of the undersigned's responsibilities to comply
with Section 16 of the Securities Exchange Act of 1934.

     This Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 3, 4, and 5 with respect to the
undersigned's holdings of, and transactions in, securities issued by the
Company, unless earlier revoked by the undersigned in a signed writing delivered
to the foregoing attorneys-in-fact.

     IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be
executed as of this 29th day of January, 2020.


                                                /s/ Richard Ashworth
                                                --------------------------------
                                                Signature


                                                Richard Ashworth
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                                                Print Name