REVENUE RECOGNITION DISAGGREGATION OF REVENUES REVENUE RECOGNITION DISAGGREGATION OF REVENUES (Tables)
   | 
12 Months Ended | 
Dec. 31, 2019  | 
| Disaggregation of Revenue [Line Items] | 
 
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| Revenue from External Customers by Geographic Areas | 
 The table below presents our consolidated sales by geographic area. Net sales attributed to geographic areas were based on the location of the customer.  
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Years ended December 31,  | 
 
In millions  | 
   | 
2019  | 
   | 
2018  | 
   | 
2017  | 
 
United States  | 
   | 
$  | 
13,519  | 
 
  | 
   | 
$  | 
13,218  | 
 
  | 
   | 
$  | 
11,010  | 
 
  | 
 
China  | 
   | 
2,331  | 
 
  | 
   | 
2,324  | 
 
  | 
   | 
2,137  | 
 
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India  | 
   | 
848  | 
 
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   | 
965  | 
 
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   | 
805  | 
 
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Other international  | 
   | 
6,873  | 
 
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   | 
7,264  | 
 
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   | 
6,476  | 
 
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Total net sales  | 
   | 
$  | 
23,571  | 
 
  | 
   | 
$  | 
23,771  | 
 
  | 
   | 
$  | 
20,428  | 
 
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| Engine | 
 
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| Disaggregation of Revenue [Line Items] | 
 
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| Revenue from External Customers by Market | 
 Engine segment external sales by market were as follows: 
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Years ended December 31,  | 
 
In millions  | 
   | 
2019  | 
   | 
2018  | 
 
Heavy-duty truck  | 
   | 
$  | 
2,626  | 
 
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$  | 
2,885  | 
 
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Medium-duty truck and bus  | 
   | 
2,244  | 
 
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   | 
2,536  | 
 
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Light-duty automotive  | 
   | 
1,656  | 
 
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   | 
1,501  | 
 
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Total on-highway  | 
   | 
6,526  | 
 
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   | 
6,922  | 
 
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Off-highway  | 
   | 
1,044  | 
 
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   | 
1,080  | 
 
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Total sales  | 
   | 
$  | 
7,570  | 
 
  | 
   | 
$  | 
8,002  | 
 
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| Distribution | 
 
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| Disaggregation of Revenue [Line Items] | 
 
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| Revenue from External Customers by Geographic Areas | 
 Distribution segment external sales by region were as follows: 
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Years ended December 31,  | 
 
In millions  | 
   | 
2019  | 
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2018  | 
 
North America  | 
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$  | 
5,513  | 
 
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$  | 
5,331  | 
 
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Asia Pacific  | 
   | 
875  | 
 
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   | 
851  | 
 
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Europe  | 
   | 
528  | 
 
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   | 
536  | 
 
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China  | 
   | 
356  | 
 
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   | 
317  | 
 
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Africa and Middle East  | 
   | 
235  | 
 
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   | 
242  | 
 
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India  | 
   | 
200  | 
 
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   | 
192  | 
 
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Latin America  | 
   | 
176  | 
 
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   | 
169  | 
 
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Russia  | 
   | 
157  | 
 
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   | 
169  | 
 
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Total sales  | 
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$  | 
8,040  | 
 
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$  | 
7,807  | 
 
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| Revenue from External Customers by Products and Services | 
 Distribution segment external sales by product line were as follows: 
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Years ended December 31,  | 
 
In millions  | 
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2019  | 
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2018  | 
 
Parts  | 
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$  | 
3,278  | 
 
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$  | 
3,222  | 
 
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Power generation  | 
   | 
1,777  | 
 
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   | 
1,482  | 
 
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Engines  | 
   | 
1,511  | 
 
  | 
   | 
1,632  | 
 
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Service  | 
   | 
1,474  | 
 
  | 
   | 
1,471  | 
 
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Total sales  | 
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$  | 
8,040  | 
 
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$  | 
7,807  | 
 
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| Components | 
 
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| Disaggregation of Revenue [Line Items] | 
 
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| Revenue from External Customers by Products and Services | 
 Components segment external sales by business were as follows: 
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Years ended December 31,  | 
 
In millions  | 
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2019  | 
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2018  | 
 
Emission solutions  | 
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$  | 
2,763  | 
 
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$  | 
2,780  | 
 
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Filtration  | 
   | 
1,024  | 
 
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   | 
1,010  | 
 
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Turbo technologies  | 
   | 
696  | 
 
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   | 
761  | 
 
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Automated transmissions  | 
   | 
534  | 
 
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   | 
543  | 
 
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Electronics and fuel systems  | 
   | 
236  | 
 
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   | 
237  | 
 
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Total sales  | 
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$  | 
5,253  | 
 
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$  | 
5,331  | 
 
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| Power Systems | 
 
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| Disaggregation of Revenue [Line Items] | 
 
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| Revenue from External Customers by Products and Services | 
 Power Systems segment external sales by product line were as follows: 
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Years ended December 31,  | 
 
In millions  | 
   | 
2019  | 
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2018  | 
 
Power generation  | 
   | 
$  | 
1,414  | 
 
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$  | 
1,467  | 
 
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Industrial  | 
   | 
908  | 
 
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   | 
801  | 
 
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Generator technologies  | 
   | 
348  | 
 
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   | 
357  | 
 
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Total sales  | 
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$  | 
2,670  | 
 
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$  | 
2,625  | 
 
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