Citi has been simplifying its structure by selling retail operations in several countries, shrinking its US branch network and disposing of non-core businesses.
The bank's shares rose 2.5 percent to $57.94 in premarket trading on Thursday.
Operating expenses in Citicorp, the bank's core businesses, fell 6 percent to $9.8 billion in the second quarter and were down 1 percent when adjusted for currency changes.
The expenses included $61 million in restructuring charges, down from $397 million a year earlier.
Revenue from Citicorp was unchanged at $17.5 billion, but rose 5 percent after adjusting for changes in foreign exchange rates.
Goldman Sachs Group Inc, which reported results earlier on Thursday, said quarterly profit more than halved, hurt by weaker trading revenue and litigation expenses.
Also Read
Citi's net income rose to $4.85 billion, or $1.51 per share, in the quarter ended June 30 from $181 million, or 3 cents per share, a year earlier, when the bank was hit by a $3.8 billion legal charge.
Adjusting for legal costs and some accounting items, Citi's net income rose 18 percent to $4.65 billion, or $1.45 per share, from $3.93 billion, or $1.24 per share, a year earlier.