Condensed Consolidated Statements of Financial Position - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 757	$ 790
Short-term investments	654	138
Receivables, net	3,314	3,112
Fiduciary assets	13,794	11,834
Other current assets	471	602
Total current assets	18,990	16,476
Goodwill	8,356	8,165
Intangible assets, net	699	783
Fixed assets, net	615	621
Operating lease right-of-use assets	941	929
Deferred tax assets	654	645
Prepaid pension	1,192	1,216
Other non-current assets	548	570
Total assets	31,995	29,405
Current liabilities
Accounts payable and accrued liabilities	1,488	1,939
Short-term debt and current portion of long-term debt	782	712
Fiduciary liabilities	13,794	11,834
Other current liabilities	1,319	1,086
Total current liabilities	17,383	15,571
Long-term debt	7,229	6,627
Non-current operating lease liabilities	947	944
Deferred tax liabilities	200	199
Pension, other postretirement, and postemployment liabilities	1,641	1,738
Other non-current liabilities	900	877
Total liabilities	28,300	25,956
Equity
Ordinary shares - $0.01 nominal value Authorized: 500 shares (issued: 2020 - 231.5; 2019 - 232.1)	2	2
Additional paid-in capital	6,144	6,152
Retained earnings	1,751	1,254
Accumulated other comprehensive loss	(4,296)	(4,033)
Total Aon shareholders' equity	3,601	3,375
Noncontrolling interests	94	74
Total equity	3,695	3,449
Total liabilities and equity	$ 31,995	$ 29,405
Common stock, nominal or par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares (in shares)	500,000,000	500,000,000
Common stock, issued shares (in shares)	231,500,000	232,100,000