NOTE 2. Revenue

Contract Balances:

Deferred revenue (current portion) as of March 31, 2019 and December 31, 2018 was $619 million and $617 million, respectively, and primarily relates to revenue that is recognized over time for one-year software license contracts, the changes in balance of which are related to the satisfaction or partial satisfaction of these contracts. The balance also contains a deferral for goods that are in-transit at period end for which control transfers to the customer upon delivery. Approximately $370 million of the December 31, 2018 balance was recognized as revenue during the three months ended March 31, 2019, while approximately $280 million of the December 31, 2017 balance was recognized as revenue during the three months ended March 31, 2018. The amount of noncurrent deferred revenue is not significant.

Disaggregated revenue information:

The Company views the following disaggregated disclosures as useful to understanding the composition of revenue recognized during the respective reporting periods:


	Three months ended
	March 31,
Net Sales (Millions)	2019		2018
Abrasives	$	433	$	473
Adhesives and Tapes		807		842
Advanced Materials		312		304
Automotive and Aerospace		500		556
Automotive Aftermarket		390		419
Closure and Masking Systems		278		307
Separation and Purification		214		235
Other Industrial		(5)		(1)
Total Industrial Business Group	$	2,929	$	3,135

Commercial Solutions	$	458	$	485
Personal Safety		939		957
Roofing Granules		92		101
Transportation Safety		217		237
Other Safety and Graphics		(2)		(1)
Total Safety and Graphics Business Group	$	1,704	$	1,779

Drug Delivery	$	92	$	119
Food Safety		83		81
Health Information Systems		260		205
Medical Solutions		764		777
Oral Care		341		354
Other Health Care		—		(1)
Total Health Care Business Group	$	1,540	$	1,535

Electronics	$	863	$	930
Energy		330		420
Other Electronics and Energy		(3)		—
Total Electronics and Energy Business Group	$	1,190	$	1,350

Consumer Health Care	$	98	$	102
Home Care		258		269
Home Improvement		462		458
Stationery and Office		294		303
Other Consumer		11		13
Total Consumer Business Group	$	1,123	$	1,145

Corporate and Unallocated	$	21	$	—
Elimination of Dual Credit		(644)		(666)
Total Company	$	7,863	$	8,278


	Three months ended March 31, 2019
Net Sales (Millions)		United States		Asia Pacific		Europe, Middle East and Africa		Latin America and Canada		Other Unallocated		Worldwide
Industrial		$	1,082	$	823	$	727	$	297	$	—	$	2,929
Safety and Graphics			635		469		408		191		1		1,704
Health Care			725		305		378		132		—		1,540
Electronics and Energy			203		840		94		53		—		1,190
Consumer			631		266		130		96		—		1,123
Corporate and Unallocated			19		2		—		3		(3)		21
Elimination of Dual Credit			(249)		(227)		(113)		(55)		—		(644)
Total Company		$	3,046	$	2,478	$	1,624	$	717	$	(2)	$	7,863


	Three months ended March 31, 2018
Net Sales (Millions)		United States		Asia Pacific		Europe, Middle East and Africa		Latin America and Canada		Other Unallocated		Worldwide
Industrial		$	1,100	$	937	$	787	$	312	$	(1)	$	3,135
Safety and Graphics			652		493		436		198		—		1,779
Health Care			702		298		394		141		—		1,535
Electronics and Energy			229		910		145		67		(1)		1,350
Consumer			610		286		143		106		—		1,145
Corporate and Unallocated			(1)		—		—		—		1		—
Elimination of Dual Credit			(248)		(248)		(113)		(57)		—		(666)
Total Company		$	3,044	$	2,676	$	1,792	$	767	$	(1)	$	8,278