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Commitments and contingencies (Tables)
 12 Months Ended
Dec. 31, 2020
Other Provisions, Contingent Liabilities And Contingent Assets [Abstract]  
Contractual obligation, fiscal year maturity schedule
The following table is a summary of our contractual obligations at December 31, 2020 that are due in each of the next five years and thereafter.
2021 2022 2023 2024 2025 THERE-
AFTER		 TOTAL
Commitments for property, plant and
equipment and intangible assets		 975  835  608  416  250  352  3,436 
Purchase obligations 545  479  331  225  144  269  1,993 
Leases committed not yet commenced 2  2  1  1  —  —  6 
Total 1,522  1,316  940  642  394  621  5,435