Aon has reported second-quarter net income of $US188 million ($257 million), down 40% on the corresponding period last year.

Total revenue fell 4% to $US2.81 billion ($3.84 billion), driven mainly by unfavourable foreign currency translation.

Operating expenses increased 2% to $US2.53 billion ($3.46 billion), mainly due to $US176 million ($241 million) of legacy litigation expenses.

For the six months to June 30, net income was down 18% to $US529 million ($723 million), while revenue fell 4% to $US5.65 billion ($7.73 billion).

President and CEO Greg Case says he is confident about the second half.

“Despite macroeconomic headwinds, we expect solid performance across each of our four key financial metrics for the second half of the year,” he said. “This includes significant free cashflow growth, placing us firmly on track towards our goal of delivering $US2.3 billion ($3.15 billion) or more of free cashflow for the full year 2017.”