Exhibit 24

POWER OF ATTORNEY

	Know all by these presents that the undersigned hereby constitutes and appoints
each of Kathryn McNamara Corley, Jennifer K. Schott and Jeffrey J. Pochowicz,
signing singly, the undersigned's true and lawful attorney-in-fact to:

(1) 	execute for and on behalf of the undersigned, all reports to be filed by
the undersigned pursuant to Section 16(a) of the Securities Exchange Act of
1934, as amended (the "Exchange Act"), and the rules promulgated thereunder
(including Forms 3, 4 and 5, and any successor forms) (the "Section 16 Reports")
with respect to the equity securities of Discover Financial Services (the
"Company"); and

(2) 	do and perform any and all acts for and on behalf of the undersigned that
may be necessary or desirable to complete and execute any such Section 16
Reports, complete and execute any amendment or amendments thereto, and file such
report with the U.S. Securities and Exchange Commission and any stock exchange
or similar authority; and

(3) 	take any other action of any type whatsoever in connection with the
foregoing that, 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 powers granted above may be exercised by each such attorney-in-fact
on behalf of the undersigned, individually, and on behalf of the undersigned in
any fiduciary or representative capacity in which the undersigned may be acting.

	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 Exchange Act.

	This Power of Attorney shall be effective as of the date set forth below and
shall continue in full force and effect until the undersigned is no longer
required to file Section 16 Reports with respect to the equity securities of 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 22nd day of February, 2018.


Signature:  /s/ Mark A. Thierer		          Print Name:  	Mark A. Thierer