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REVENUE RECOGNITION DISAGGREGATION OF REVENUES REVENUE RECOGNITION DISAGGREGATION OF REVENUES (Notes)
 12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
Revenue from Contract with Customer
NOTE 2. REVENUE FROM CONTRACTS WITH CUSTOMERS
Long-term Contracts
The majority of our contracts are for a period of less than one year. We have certain long-term maintenance agreements, construction contracts and extended warranty coverage arrangements that span a period in excess of one year. The aggregate amount of the transaction price for long-term maintenance agreements and construction contracts allocated to performance obligations that were not satisfied as of December 31, 2021, was $740 million. We expect to recognize the related revenue of $114 million over the next 12 months and $626 million over periods up to 10 years. See Note 13,"PRODUCT WARRANTY LIABILITY," for additional disclosures on extended warranty coverage arrangements. Our other contracts generally are for a duration of less than one year, include payment terms that correspond to the timing of costs incurred when providing goods and services to our customers or represent sales-based royalties.
Deferred and Unbilled Revenue
The following is a summary of our unbilled and deferred revenue and related activity:
Years ended December 31,
In millions20212020
Unbilled revenue$100 $114 
Deferred revenue, primarily extended warranty1,705 1,531 
We recognized revenue of $509 million and $372 million in 2021 and 2020, respectively, that was included in the deferred revenue balance at the beginning of each year. We did not record any impairment losses on our unbilled revenues during 2021 or 2020.
Disaggregation of Revenue
Consolidated Revenue
The table below presents our consolidated sales by geographic area. Net sales attributed to geographic areas were based on the location of the customer.
Years ended December 31,
In millions202120202019
United States$12,489 $10,605 $13,519 
China3,169 2,832 2,331 
India1,133 680 848 
Other international7,230 5,694 6,873 
Total net sales$24,021 $19,811 $23,571 
Segment Revenue
Engine segment external sales by market were as follows:
Years ended December 31,
In millions202120202019
Heavy-duty truck$2,511 $1,800 $2,626 
Medium-duty truck and bus1,978 1,629 2,244 
Light-duty automotive1,845 1,441 1,656 
Total on-highway6,334 4,870 6,526 
Off-highway1,255 1,055 1,044 
Total sales$7,589 $5,925 $7,570 
Distribution segment external sales by region were as follows:
Years ended December 31,
In millions202120202019
North America$4,902 $4,688 $5,513 
Asia Pacific901 799 875 
Europe647 597 528 
Russia334 191 157 
China323 340 356 
Africa and Middle East259 198 235 
India194 150 200 
Latin America182 147 176 
Total sales$7,742 $7,110 $8,040 
Distribution segment external sales by product line were as follows:
Years ended December 31,
In millions202120202019
Parts$3,136 $2,921 $3,278 
Power generation1,754 1,686 1,777 
Engines1,493 1,245 1,511 
Service1,359 1,258 1,474 
Total sales$7,742 $7,110 $8,040 
Components segment external sales by business were as follows:
Years ended December 31,
In millions202120202019
Emission solutions$3,142 $2,352 $2,763 
Filtration1,171 1,005 1,024 
Turbo technologies787 673 696 
Automated transmissions481 303 534 
Electronics and fuel systems351 317 236 
Total sales$5,932 $4,650 $5,253 
Power Systems segment external sales by product line were as follows:
Years ended December 31,
In millions202120202019
Power generation$1,481 $1,155 $1,414 
Industrial820 638 908 
Generator technologies349 262 348 
Total sales$2,650 $2,055 $2,670