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Operating Expenses (Tables) | 12 Months Ended
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Dec. 31, 2021
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Summary of Consolidated Operating Expense | Consolidated operating expenses during 2021, 2020 and 2019 by function are as follows:
|  | 2021 |  |  | 2020 |  |  | 2019 |
Administrative expenses 1, 2 |  | $ | 979 |  |  |  | 1,069 |  |  |  | 1,104 |
Selling expenses 2 |  |  | 324 |  |  |  | 330 |  |  |  | 366 |
Total administrative and selling expenses |  |  | 1,303 |  |  |  | 1,399 |  |  |  | 1,470 |
Distribution and logistics expenses |  |  | 1,636 |  |  |  | 1,412 |  |  |  | 1,476 |
Total operating expenses |  | $ | 2,939 |  |  |  | 2,811 |  |  |  | 2,946 |
1 | All significant R&D activities are executed by several internal areas of CEMEX as part of their daily activities. In 2021, 2020 and 2019, total combined expenses of these departments recognized within administrative expenses were $35, $31 and $38, respectively.
2 | In 2021, 2020 and 2019, administrative expenses include depreciation and amortization of $142, $145 and $132, respectively, and selling expenses include depreciation and amortization of $49 in 2021, $50 in 2020 and $48 in 2019.
Disclosure Of Operating Expenses By Nature | Consolidated operating expenses during 2021, 2020 and 2019 by nature are as follows:
|  | 2021 |  |  | 2020 |  |  | 2019 |
Transportation costs |  | $ | 1,502 |  |  |  | 1,313 |  |  |  | 1,371 |
Payroll |  |  | 915 |  |  |  | 945 |  |  |  | 961 |
Depreciation and amortization |  |  | 191 |  |  |  | 195 |  |  |  | 180 |
Professional legal, accounting and advisory services |  |  | 145 |  |  |  | 176 |  |  |  | 180 |
Maintenance, repairs and supplies |  |  | 78 |  |  |  | 74 |  |  |  | 78 |
Other operating expenses |  |  | 108 |  |  |  | 108 |  |  |  | 176 |
|  | $ | 2,939 |  |  |  | 2,811 |  |  |  | 2,946 |

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