REVENUE

12 Months Ended

Dec. 31, 2020

Revenue from Contract with Customer [Abstract]

D. REVENUE

Our revenues are derived primarily from sales to customers in North America and Internationally, principally Europe. Net sales from these geographic markets, by segment, were as follows, in millions:


	Year Ended December 31, 2020
	Plumbing Products		Decorative Architectural Products		Total
Primary geographic markets:
North America	$	2,753	$	3,052	$	5,805
International, principally Europe	1,383		—		1,383
Total	$	4,136	$	3,052	$	7,188


	Year Ended December 31, 2019
	Plumbing Products		Decorative Architectural Products		Total
Primary geographic markets:
North America	$	2,605	$	2,723	$	5,328
International, principally Europe	1,379		—		1,379
Total	$	3,984	$	2,723	$	6,707


	Year Ended December 31, 2018
	Plumbing Products		Decorative Architectural Products		Total
Primary geographic markets:
North America	$	2,552	$	2,656	$	5,208
International, principally Europe	1,446		—		1,446
Total	$	3,998	$	2,656	$	6,654

We recognized increases to revenue of $7 million, $2 million, and $4 million in 2020, 2019, and 2018, respectively, for variable consideration related to performance obligations settled in previous periods.

We record contract assets for items for which we have satisfied our performance obligation but our receipt of payment is contingent upon delivery or other circumstances other than the passage of time. Our contract assets are recorded in prepaid expenses and other in our consolidated balance sheets. Our contract assets generally become unconditional and are reclassified to receivables in the quarter subsequent to each balance sheet date. Our contract asset balance was $2 million at both December 31, 2020 and 2019.

We record contract liabilities primarily for deferred revenue. Our contract liabilities are recorded in accrued liabilities in our consolidated balance sheets. Our contract liabilities are generally recognized to net sales in the immediately subsequent reporting period. Our contract liability balance was $62 million and $40 million at December 31, 2020 and 2019, respectively.

Changes in the allowance for credit losses deducted from accounts receivable were as follows, in millions:


	Year Ended December 31, 2020
Balance at January 1 (after adopting ASU 2016-13)	$	5
Provision for expected credit losses during the period	3
Write-offs charged against the allowance	(2)
Recoveries of amounts previously written off	1

Balance at end of year	$	7