Generally, the Company recognizes revenue on a point-in-time basis when the customer takes title to the goods and assumes the risks and rewards for the goods. For customized goods where the Company has a legally enforceable right to payment for the goods, the Company recognizes revenue over time which, generally, is as the goods are produced.

Disaggregated Revenue

A geographic disaggregation of revenues across our company segmentation in the following tables provide information to assist in evaluating the nature, timing and uncertainty of revenue and cash flows and how they may be impacted by economic factors.



	Three Months Ended March 31, 2019
In millions	Industrial Packaging			Global Cellulose Fibers		Printing Papers			Corporate and Inter-segment Sales			Total
Primary Geographical Markets (a)
United States	$	3,146		$	570	$	488		$	60		$	4,264
EMEA	428			81		330			(2		)	837
Pacific Rim and Asia	18			38		59			4			119
Americas, other than U.S.	240			—		188			(5		)	423
Total	$	3,832		$	689	$	1,065		$	57		$	5,643

Operating Segments
North American Industrial Packaging	$	3,376		$	—	$	—		$	—		$	3,376
EMEA Industrial Packaging	339			—		—			—			339
Brazilian Industrial Packaging	57			—		—			—			57
European Coated Paperboard	91			—		—			—			91
Global Cellulose Fibers	—			689		—			—			689
North American Printing Papers	—			—		496			—			496
Brazilian Papers	—			—		215			—			215
European Papers	—			—		309			—			309
Indian Papers	—			—		53			—			53
Intra-segment Eliminations	(31		)	—		(8		)	—			(39		)
Corporate & Inter-segment Sales	—			—		—			57			57
Total	$	3,832		$	689	$	1,065		$	57		$	5,643

(a) Net sales are attributed to countries based on the location of the seller.



	Three Months Ended March 31, 2018
In millions	Industrial Packaging			Global Cellulose Fibers		Printing Papers			Corporate & Intersegment			Total
Primary Geographical Markets (a)
United States	$	3,102		$	545	$	440		$	58		$	4,145
EMEA	452			75		336			(5		)	858
Pacific Rim and Asia	34			57		64			16			171
Americas, other than U.S.	239			—		213			(5		)	447
Total	$	3,827		$	677	$	1,053		$	64		$	5,621

Operating Segments
North American Industrial Packaging	$	3,369		$	—	$	—		$	—		$	3,369
EMEA Industrial Packaging	362			—		—			—			362
Brazilian Industrial Packaging	62			—		—			—			62
European Coated Paperboard	92			—		—			—			92
Global Cellulose Fibers	—			677		—			—			677
North American Printing Papers	—			—		458			—			458
Brazilian Papers	—			—		229			—			229
European Papers	—			—		319			—			319
Indian Papers	—			—		52			—			52
Intra-segment Eliminations	(58		)	—		(5		)	—			(63		)
Corporate & Inter-segment Sales	—			—		—			64			64
Total	$	3,827		$	677	$	1,053		$	64		$	5,621

(a) Net sales are attributed to countries based on the location of the seller.

Revenue Contract Balances

The opening and closing balances of the Company's contract assets and current contract liabilities are as follows:



In millions	Contract Assets (Short-Term)		Contract Liabilities (Short-Term)
Beginning Balance - January 1, 2019	$	395	$	56
Ending Balance - March 31, 2019	410		53
Increase / (Decrease)	$	15	$	(3	)

A contract asset is created when the Company recognizes revenue on its customized products prior to having an unconditional right to payment from the customer, which generally does not occur until title and risk of loss passes to the customer.

A contract liability is created when customers prepay for goods prior to the Company transferring those goods to the customer. The contract liability is reduced once control of the goods is transferred to the customer. The majority of our customer prepayments are received during the fourth quarter each year for goods that will be transferred to customers over the following twelve months.

The difference between the opening and closing balances of the Company's contract assets and contract liabilities primarily results from the difference between the price and quantity at comparable points in time for goods for which we have an unconditional right to payment or receive pre-payment from the customer, respectively.