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Revenue
 3 Months Ended
Mar. 31, 2022
Revenue from Contract with Customer [Abstract]  
Revenue Revenue
We recognize revenue at a point in time when the customer obtains control of the promised products. For most transactions this occurs when products are shipped from our manufacturing facilities or at a later point when control of the products transfers to the customer at a specified destination or time.
Contract assets represent our rights to consideration in exchange for products that have transferred to a customer when the right is conditional on situations other than the passage of time. For products that we have transferred to our customers, our rights to the consideration are typically unconditional and only the passage of time is required before payments become due. These unconditional rights are recorded as accounts receivable. As of March 31, 2022, and December 31, 2021, we did not have material contract asset balances.
Contract liabilities represent our obligations to transfer products to a customer for which we have received consideration from the customer. From time to time, we may receive advance payment from our customers that is accounted for as deferred revenue. Deferred revenue is earned when control of the product transfers to the customer, which is typically within a short period of time from when we received the advanced payment. Contract liability balances as of March 31, 2022 and December 31, 2021 were approximately $6 million and $2 million, respectively. Contract liability balances were reported as “Accounts payable” in the unaudited Condensed Consolidated Balance Sheets.  All material contract liabilities as of December 31, 2021 were recognized as revenue in “Net sales” in the unaudited Condensed Consolidated Statements of Income during the first quarter of 2022.
Disaggregation of Revenue
We operate under one operating and reportable segment, Tronox. We disaggregate our revenue from contracts with customers by product type and geographic area. We believe this level of disaggregation appropriately depicts how the nature, amount, timing and uncertainty of our revenue and cash flows are affected by economic factors and reflects how our business is managed.
Net sales to external customers by geographic areas where our customers are located were as follows:
Three Months Ended March 31,
20222021
North America$195 $169 
South and Central America67 63 
Europe, Middle-East and Africa377 357 
Asia Pacific326 302 
Total net sales$965 $891 

Net sales from external customers for each similar type of product were as follows:
Three Months Ended March 31,
20222021
TiO2
$773 $696 
Zircon108 123 
Feedstock and other products84 72 
Total net sales$965 $891 
Feedstock and other products mainly include pig iron, ilmenite, chloride (“CP”) slag, TiCl4 and other mining products.
During the three months ended March 31, 2022 and 2021, our ten largest third-party customers represented 30% and 29%, respectively, of our consolidated net sales. During the three months ended March 31, 2022 and 2021, no single customer accounted for 10% of our consolidated net sales.