Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Non-interest revenues
Discount revenue		$ 19,186	$ 18,680	$ 19,297
Net card fees		3,090	2,886	2,700
Other fees and commissions		3,022	2,753	2,866
Other		1,732	2,029	2,033
Total non-interest revenues		27,030	26,348	26,896
Interest income
Interest on loans		8,138	7,205	7,309
Interest and dividends on investment securities		89	131	157
Deposits with banks and other		326	139	79
Total interest income		8,553	7,475	7,545
Interest expense
Deposits		779	598	475
Long-term debt and other		1,333	1,106	1,148
Total interest expense		2,112	1,704	1,623
Net interest income		6,441	5,771	5,922
Total revenues net of interest expense		33,471	32,119	32,818
Provisions for losses
Charge Card		795	696	737
Card member loans		1,868	1,235	1,190
Other		96	95	61
Total provisions for losses		2,759	2,026	1,988
Total revenues net of interest expense after provisions for losses		30,712	30,093	30,830
Expenses
Marketing and promotion		3,217	3,650	3,109
Card Member rewards		7,608	6,793	6,996
Card Member services and other		1,439	1,133	1,018
Salaries and employee benefits		5,258	5,259	4,976
Other,net		5,776	5,162	6,793
Total Expenses		23,298	21,997	22,892
Pretax income		7,414	8,096	7,938
Income tax provision		4,678	2,688	2,775
Net income		$ 2,736	$ 5,408	$ 5,163
Earnings per Common Share
Basic	[1]	$ 2.98	$ 5.67	$ 5.07
Diluted		$ 2.97	$ 5.65	$ 5.05
Average common shares outstanding for earnings per common share:
Basic		883	933	999
Diluted		886	935	1,003

[1] Represents net income less (i) earnings allocated to participating share awards of $ 21 million, $ 43 million and $ 38 million for the years ended December 31, 2017 , 2016 and 2015 , respectively, and (ii) dividends on preferred shares of $ 81 million, $ 80 million and $ 62 million for the years ended December 31, 2017 , 2016 and 2015 , respectively.