Fitch Ratings affirmed the BBB+ long-term issuer default ratings and F2 short-term issuer default ratings of Aon plc and Aon Corp.

The outlook is stable.

Fitch said the affirmation is based on Aon plc's continued favorable competitive position, solid balance sheet and cash flow generation and very good financial flexibility, partially offset by a moderate run-rate level of financial leverage, all of which are within guidelines for the current rating category.