

($ in millions)		2018		2017
Receivables
	Trade - net⁽¹⁾		$2,505		$2,559
	Equity affiliates	4		5
	Other - net	336		339
	Total		$2,845		$2,903
Inventories⁽²⁾
	Finished products		$1,105		$1,083
	Work in process	193		177
	Raw materials	452		437
	Supplies	33		33
	Total		$1,783		$1,730
Accounts payable and accrued liabilities
	Trade		$2,177		$2,321
	Accrued payroll	424		441
	Customer rebates	283		261
	Other postretirement and pension benefits	80		78
	Income taxes	112		100
	Other	547		580
	Total		$3,623		$3,781


(1)	Allowance for doubtful accounts was $24 million and $25 million as of December 31, 2018 and 2017, respectively.

(2)

Inventories valued using the LIFO method of inventory valuation comprised 36% and 34% of total gross inventory values as of December 31, 2018 and 2017, respectively. If the FIFO method of inventory valuation had been used, inventories would have been $113 million and $103 million higher as of December 31, 2018 and 2017, respectively. During the years ended December 31, 2018 and 2017, certain inventories accounted for on the LIFO method of accounting were reduced, which resulted in the liquidation of certain quantities carried at costs prevailing in prior years. The effect on Income before income taxes was income of $2 million and zero for the years ended December 31, 2018 and 2017, respectively.