You can see how big the CC biz contributed to Citi's profit as it earned twice as much as HSBC did (No.3 in both Profitability and Market Cap).
So Citi is No.1 in 3 cat. out of 4 per Wiki, but HSBC is among the top 3.
Top ten bank holding companies in the world ranked by profit
Figures in U.S. dollars, and as 2003
Citigroup — 21 billion
Bank of America — 15 billion
HSBC — 10 billion
Royal Bank of Scotland — 8 billion
Wells Fargo — 7 billion
JP Morgan Chase — 7 billion
UBS AG — 6 billion
Wachovia — 5 billion
Morgan Stanley — 5 billion
Merrill Lynch — 4 billion
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Top ten banks in the world ranked by market capitalisation
Figures in U.S. dollars, and as at 26 July 2006[4]
Citigroup — 235 billion
Bank of America — 230 billion
HSBC — 200 billion
JPMorgan Chase — 150 billion
Mitsubishi UFJ — 145 billion
Wells Fargo — 120 billion
UBS — 110 billion
Royal Bank of Scotland — 100 billion
China Construction Bank — 100 billion
Mizuho — 95 billion