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Railway Operating Revenues
 12 Months Ended
Dec. 31, 2022
Revenue from Contract with Customer [Abstract]  
Railway Operating Revenues Railway Operating Revenues
The following table disaggregates our revenues by major commodity group:
202220212020
($ in millions)
Merchandise:
Agriculture, forest and consumer products$2,493 $2,251 $2,116 
Chemicals2,148 1,951 1,809 
Metals and construction1,652 1,562 1,333 
Automotive1,038 905 830 
Merchandise7,331 6,669 6,088 
Intermodal3,681 3,163 2,654 
Coal1,733 1,310 1,047 
Total$12,745 $11,142 $9,789 

We recognize the amount of revenues to which we expect to be entitled for the transfer of promised goods or services to customers. A performance obligation is created when a customer under a transportation contract or public tariff submits a bill of lading to us for the transport of goods. These performance obligations are satisfied as the shipments move from origin to destination. As such, transportation revenues are recognized proportionally as a shipment moves, and related expenses are recognized as incurred. These performance obligations are generally short-term in nature with transit days averaging approximately one week or less for each commodity group. The customer has an unconditional obligation to pay for the service once the service has been completed. Estimated revenues associated with in-process shipments at period-end are recorded based on the estimated percentage of service completed. We had no material remaining performance obligations at December 31, 2022 and 2021.

We may provide customers ancillary services, such as switching, demurrage and other incidental activities, under their transportation contracts. The revenues associated with these distinct performance obligations are recognized when the services are performed or as contractual obligations are met. These revenues are included within each of the commodity groups and represent approximately 7%, 7% and 5%, respectively, of total “Railway operating revenues” on the Consolidated Statements of Income for the years ended December 31, 2022, 2021, and 2020.

Revenues related to interline transportation services that involve another railroad are reported on a net basis. Therefore, the portion of the amount that relates to another party is not reflected in revenues.

Under the typical terms of our freight contracts, payment for services is due within fifteen days of billing the customer, thus there are no significant financing components. “Accounts receivable – net” on the Consolidated Balance Sheets includes both customer and non-customer receivables as follows:
December 31,
20222021
($ in millions)
Customer$895 $741 
Non-customer253 235 
  Accounts receivable – net$1,148 $976 

Non-customer receivables include non-revenue-related amounts due from other railroads, governmental entities, and others.  There were no non-current customer receivables at December 31, 2022, while “Other assets” on the
Consolidated Balance Sheets included $23 million at December 31, 2021. We do not have any material contract assets or liabilities at December 31, 2022 and 2021.