Condensed Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Interest income
Credit card loans	$ 3,726	$ 2,783	$ 10,513	$ 7,475
Other loans	653	476	1,823	1,343
Investment securities	120	35	327	104
Other interest income	111	63	314	86
Total interest income	4,610	3,357	12,977	9,008
Interest expense
Deposits	1,061	345	2,722	658
Short-term borrowings	2	1	2	2
Long-term borrowings	225	168	622	416
Total interest expense	1,288	514	3,346	1,076
Net interest income	3,322	2,843	9,631	7,932
Provision for credit losses	1,702	773	4,109	1,476
Net interest income after provision for credit losses	1,620	2,070	5,522	6,456
Other income
Discount and interchange revenue, net	377	335	1,077	1,023
Protection products revenue	42	42	129	128
Loan fee income	194	168	546	450
Transaction processing revenue	82	65	221	183
Gains (losses) on equity investments	6	(4)	(11)	(208)
Other income	21	19	71	64
Total other income	722	625	2,033	1,640
Other expense
Employee compensation and benefits	575	551	1,788	1,566
Marketing and business development	283	276	792	722
Information processing and communications	149	124	438	370
Professional fees	281	241	729	607
Premises and equipment	22	22	64	70
Other expense	144	154	430	386
Total other expense	1,454	1,368	4,241	3,721
Income before income taxes	888	1,327	3,314	4,375
Total NonInterest Income Expenses	-732.0	-743.0	-2208.0	-2081.0	0.0
Income tax expense	205	314	762	1,026
Net income	683	1,013	2,552	3,349
Net income allocated to common stockholders	$ 647	$ 975	$ 2,473	$ 3,267
Basic earnings per common share	$ 2.59	$ 3.57	$ 9.70	$ 11.70
Diluted earnings per common share	$ 2.59	$ 3.56	$ 9.69	$ 11.69

Includes discount revenue and acquirer interchange net of interchange paid to third-party issuers. Discount revenue is earned from fees charged to merchants with whom the entity has entered into card acceptance agreements for processing cardholder purchase transactions and acquirer interchange revenue from merchant acquirers on all Discover Network card transactions made by cardholders at merchants with whom merchant acquirers have entered into card acceptance agreements for processing cardholder purchase transactions.

No definition available.