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Company Redomestication (Details) (USD $) In Billions, except Share data, unless otherwise specified			1 Months Ended		1 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Apr. 30, 2012 Aon plc Class A Ordinary Share	Apr. 02, 2012 Aon plc Class A Ordinary Share	Apr. 30, 2012 Aon plc Class A Ordinary Share 2012 Share Repurchase Program
Redomestication transaction
Number of shares right to receive upon conversion			1
Ordinary shares, nominal value (in dollars per share)	$ 1	$ 1		$ 0.01
Stock split, conversion basis			1
Share repurchase program, maximum authorized amount					$ 5.0

The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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