Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Non-interest revenues
Non-interest revenues		$ 7,234	$ 7,980
Interest income
Interest on loans		2,144	2,909
Interest and dividends on investment securities		24	38
Deposits with banks and other		24	99
Total interest income		2,192	3,046
Interest expense
Deposits		134	326
Long-term debt and other		228	390
Total interest expense		362	716
Net interest income		1,830	2,330
Total revenues net of interest expense		9,064	10,310
Provisions for credit losses
Provisions		(675)	2,621
Total revenues net of interest expense after provisions for credit losses		9,739	7,689
Expenses
Marketing and business development		1,766	1,705
Card Member rewards		2,243	2,392
Card Member services		317	456
Salaries and employee benefits		1,550	1,395
Other, net		870	1,289
Total expenses		6,746	7,237
Pretax income		2,993	452
Income tax provision		758	85
Net income		$ 2,235	$ 367
Earnings per Common Share
Basic (in dollars per share)	[1]	$ 2.74	$ 0.41
Diluted (in dollars per share)	[1]	$ 2.74	$ 0.41
Average common shares outstanding for earnings per common share:
Basic (in shares)		804	807
Diluted (in shares)		805	808
Card Member Receivables
Provisions for credit losses
Provisions		$ (10)	$ 597
Card Member Loans
Provisions for credit losses
Provisions		(573)	1,876
Other Loans
Provisions for credit losses
Provisions		(92)	148
Discount revenue
Non-interest revenues
Non-interest revenues		5,242	5,838
Net card fees
Non-interest revenues
Non-interest revenues		1,253	1,110
Other fees and commissions
Non-interest revenues
Non-interest revenues		520	720
Other
Non-interest revenues
Non-interest revenues		$ 219	$ 312

[1] Represents net income less (i) earnings allocated to participating share awards of $15 million and $2 million for the three months ended March 31, 2021 and 2020, respectively, and (ii) dividends on preferred shares of $14 million and $32 million for the three months ended March 31, 2021 and 2020, respectively.