Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2020		Jun. 30, 2019		Jun. 30, 2020		Jun. 30, 2019
Non-interest revenues
Non-interest revenues	$ 5,791		$ 8,764		$ 13,771		$ 17,069
Interest income
Interest on loans	2,368		2,764		5,277		5,489
Interest and dividends on investment securities	27		52		65		85
Deposits with banks and other	31		149		130		345
Total interest income	2,426		2,965		5,472		5,919
Interest expense
Deposits	260		406		586		805
Long-term debt and other	282		485		672		981
Total interest expense	542		891		1,258		1,786
Net interest income	1,884		2,074		4,214		4,133
Total revenues net of interest expense	7,675		10,838		17,985		21,202
Provisions for credit losses
Card Member receivables	355		224		952		477
Card Member loans	969		603		2,845		1,128
Other	231		34		379		65
Total provisions for credit losses	1,555		861		4,176		1,670
Total revenues net of interest expense after provisions for credit losses	6,120		9,977		13,809		19,532
Expenses
Marketing and business development	1,362		1,776		3,067		3,351
Card Member rewards	1,349		2,652		3,741		5,103
Card Member services	208		563		664		1,113
Salaries and employee benefits	1,349		1,367		2,744		2,789
Other, net	1,230		1,400		2,519		2,999
Total expenses	5,498		7,758		12,735		15,355
Pretax income	622		2,219		1,074		4,177
Income tax provision	365		458		450		866
Net income	$ 257		$ 1,761		$ 624		$ 3,311
Earnings per Common Share
Basic (in dollars per share)	$ 0.29	[1]	$ 2.07	[1]	$ 0.71	[2]	$ 3.88	[2]
Diluted (in dollars per share)	$ 0.29	[1]	$ 2.07	[1]	$ 0.71	[2]	$ 3.87	[2]
Average common shares outstanding for earnings per common share:
Basic (in shares)	804		834		806		837
Diluted (in shares)	805		836		807		839
Discount revenue [Member]
Non-interest revenues
Non-interest revenues	$ 4,015		$ 6,577		$ 9,853		$ 12,772
Net card fees [Member]
Non-interest revenues
Non-interest revenues	1,141		988		2,251		1,932
Other fees and commissions [Member]
Non-interest revenues
Non-interest revenues	449		837		1,169		1,640
Other [Member]
Non-interest revenues
Non-interest revenues	$ 186		$ 362		$ 498		$ 725

[1] Represents net income less (i) earnings allocated to participating share awards of $2 million and $13 million for the three months ended June 30, 2020 and 2019, respectively, and (ii) dividends on preferred shares of $17 million and $19 million for the three months ended June 30, 2020 and 2019, respectively.

[2] Represents net income less (i) earnings allocated to participating share awards of $4 million and $24 million for the six months ended June 30, 2020 and 2019, respectively, and (ii) dividends on preferred shares of $49 million and $40 million for the six months ended June 30, 2020 and 2019, respectively.