(8)	Other receivables

Other receivables of insurance and other businesses are comprised of the following (in millions).

 

		December 31,
		2018				2017
Insurance premiums receivable		$	12,452			$	11,058
Reinsurance recoverable on unpaid losses			3,060				3,201
Trade receivables			12,617				12,031
Other			3,823				3,464
Allowances for uncollectible accounts			(388	)			(362	)
		$	31,564			$	29,392

Receivables of our railroad and our utilities and energy businesses are comprised of the following (in millions).

 

		December 31,
		2018				2017
Trade receivables		$	3,433			$	3,346
Other			362				313
Allowances for uncollectible accounts			(129	)			(128	)
		$	3,666			$	3,531

Trade receivables include unbilled revenue of $554 million and $665 million as of December 31, 2018 and 2017, respectively, attributable to the regulated utility businesses.