Have a seat. This is important. Source: Valerie Everett.

In 2013, things at Citigroup (NYSE:C), were solid, but it turns out, one business could be the key to its success moving forward.

Citigroup's bottom line jumped 15% in 2013, despite income from its largest business, consumer banking, actually falling 11% year over year. Yet there is one critical part of that business which will be the essential to boosting Citigroup's bottom line.

A solid foundation
Things were certainly concerning from a broader consumer banking perspective, but as it turns out, when Citigroup broke out its results, it revealed the dip came almost entirely from its retail banking operations, while its card business performed quite well:

Source: Company investor relations.

This is significant because while other major consumer banks like Bank of America (NYSE:BAC), Wells Fargo (NYSE: WFC), and JPMorgan Chase all have significant credit card operations, they are nowhere near the size and scope of Citi.

Source: Company investor relations.

Perhaps even more startling than total size of Citigroup's credit card business, is also how dependent the company is on credit cards, as more than half of the revenue in its global consumer banking business is from credit cards. This is entirely unique to Citigroup when compared to its other three major peers:

Source: Company investor relations.

Ultimately, the success of Citigroup's largest business -- consumer banking -- will be dependent on its credit card operations, and a recent presentation for the Citi Cards CEO Jud Linville revealed the best may in fact be ahead.

Astounding growth
As it turns out, in 2010, Citigroup embarked on an effort to "fix the basics" of its credit card business, by reducing risk, investing in core markets, revitalizing products and service, all with the aim of restoring profitability. This was a three-year effort and in 2013, it began to "simplify & standardize" its products as it expanded its digit capabilities and improve its experience.

Stunningly, these efforts have resulted in astounding growth in profitability since the end of 2010, with the trailing 12 months of earnings growing by more than 700%:

Source: Company investor relations.

With the calendar turned to 2014, Citigroup now hopes to "optimize & differentiate," its business as it launches global rewards and "deliver world-class product suite," as it takes what it has learned from its card business in the United States and brings it to the world abroad.

The success on its execution of initiatives since 2010 has certainly been admirable. Yet its new goals in 2014 aimed at expansion will be critical. The branded card business at Citigroup delivered a return on average assets of 3.2% in 2013, four times higher than Citigroup's return on average assets of 0.74%.

This means if it is able to expand this highly profitable business, as the world's largest credit card issuer, continued improvements would be to the delight of shareholders. 

The banking revolution
Do you hate your bank? If you're like most Americans, chances are good that you answered yes to that question. While that's not great news for consumers, it certainly creates opportunity for savvy investors. That's because there's a brand-new company that's revolutionizing banking, and is poised to kill the hated traditional brick-and-mortar banking model. And amazingly, despite its rapid growth, this company is still flying under the radar of Wall Street. For the name and details on this company, click here to access our new special free report.

Patrick Morris owns shares of Bank of America. The Motley Fool recommends and owns shares of Bank of America and Wells Fargo. It also owns shares of Citigroup and JPMorgan Chase. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.

Compare Brokers