Based on The Nilson Report, here are top Ranked Credit Cards Issuers Worldwide in  2013.

United States

$Billion

$126 JPMorgan Chase

$101 B of A

$89 Amex

$86 Citibank

$68 Capital One

$53 Discover

$31 Wells Fargo

$25 U.S. Bank

$17 USAA

 

China - $Billion

$50 ICBC

$47 China Merchants

$44 China Construct.

$36 Bank of China

$32 Agricultural Bank

$27 Bank of Commun.

$19 China Minsheng

$17 China Everbright

 

United Kingdom - $Billion

$28 Barclays

 

Brazil - $Billion

$22 Itau Unibanco

 

Japan - $Billion

$18 Mitsubishi UFJ

 

Source: The Nilson Report