Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2020		Sep. 30, 2019		Sep. 30, 2020		Sep. 30, 2019
Non-interest revenues
Non-interest revenues	$ 6,877		$ 8,786		$ 20,648		$ 25,855
Interest income
Interest on loans	2,266		2,885		7,543		8,374
Interest and dividends on investment securities	33		53		98		138
Deposits with banks and other	25		142		155		487
Total interest income	2,324		3,080		7,796		8,999
Interest expense
Deposits	202		401		788		1,206
Long-term debt and other	248		476		920		1,457
Total interest expense	450		877		1,708		2,663
Net interest income	1,874		2,203		6,088		6,336
Total revenues net of interest expense	8,751		10,989		26,736		32,191
Provisions for credit losses
Card Member receivables	117		238		1,069		715
Card Member loans	571		604		3,416		1,732
Other	(23)		37		356		102
Total provisions for credit losses	665		879		4,841		2,549
Total revenues net of interest expense after provisions for credit losses	8,086		10,110		21,895		29,642
Expenses
Marketing and business development	1,822		1,821		4,889		5,172
Card Member rewards	2,004		2,614		5,745		7,717
Card Member services	259		558		923		1,671
Salaries and employee benefits	1,408		1,499		4,152		4,288
Other, net	1,229		1,352		3,748		4,351
Total expenses	6,722		7,844		19,457		23,199
Pretax income	1,364		2,266		2,438		6,443
Income tax provision	291		511		741		1,377
Net income	$ 1,073		$ 1,755		$ 1,697		$ 5,066
Earnings per Common Share
Basic (in dollars per share)	$ 1.31	[1]	$ 2.09	[1]	$ 2.01	[2]	$ 5.97	[2]
Diluted (in dollars per share)	$ 1.30	[1]	$ 2.08	[1]	$ 2.01	[2]	$ 5.95	[2]
Average common shares outstanding for earnings per common share:
Basic (in shares)	804		825		805		833
Diluted (in shares)	805		827		806		835
Discount revenue [Member]
Non-interest revenues
Non-interest revenues	$ 4,999		$ 6,566		$ 14,852		$ 19,338
Net card fees [Member]
Non-interest revenues
Non-interest revenues	1,191		1,033		3,442		2,965
Other fees and commissions [Member]
Non-interest revenues
Non-interest revenues	478		825		1,647		2,465
Other [Member]
Non-interest revenues
Non-interest revenues	$ 209		$ 362		$ 707		$ 1,087

[1] Represents net income less (i) earnings allocated to participating share awards of $7 million and $11 million for the three months ended September 30, 2020 and 2019, respectively, and (ii) dividends on preferred shares of $16 million and $21 million for the three months ended September 30, 2020 and 2019, respectively.

[2] Represents net income less (i) earnings allocated to participating share awards of $10 million and $35 million for the nine months ended September 30, 2020 and 2019, respectively, and (ii) dividends on preferred shares of $65 million and $61 million for the nine months ended September 30, 2020 and 2019, respectively.