NOTE 10 - SUPPLEMENTAL FINANCIAL STATEMENT INFORMATION

Temporary Investments

Temporary investments with an original maturity of three months or less are treated as cash equivalents and are stated at cost. Temporary investments totaled $708 million and $661 million at June 30, 2018 and December 31, 2017, respectively.

Accounts and Notes Receivable



In millions	June 30, 2018		December 31, 2017
Accounts and notes receivable, net:
Trade	$	3,230	$	3,017
Other	296		270
Total	$	3,526	$	3,287

The allowance for doubtful accounts was $74 million and $73 million at June 30, 2018 and December 31, 2017, respectively.

Inventories



In millions	June 30, 2018		December 31, 2017
Raw materials	$	271	$	274
Finished pulp, paper and packaging	1,053		1,337
Operating supplies	591		615
Other	135		87
Total	$	2,050	$	2,313

Depreciation

Accumulated depreciation was $20.8 billion and $20.5 billion at June 30, 2018 and December 31, 2017. Depreciation expense was $309 million and $310 million for the three months ended June 30, 2018 and 2017, respectively and $615 million and $609 million for the six months ended June 30, 2018 and 2017, respectively.

Interest

Interest payments made during the six months ended June 30, 2018 and 2017 were $378 million and $387 million, respectively.

Amounts related to interest were as follows:



	Three Months Ended June 30,				Six Months Ended June 30,
In millions	2018		2017		2018		2017
Interest expense	$	183	$	186	$	363	$	373
Interest income	50		49		95		94
Capitalized interest costs	9		6		17		12

Asset Retirement Obligations

The Company had recorded liabilities of $86 million related to asset retirement obligations at June 30, 2018 and December 31, 2017.