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Summary of Significant Accounting Standards and Policies - Intangible assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Gross |  |
Total other intangible assets, Gross | $ 673 | $ 634
Accumulated Amortization | (229) | (197)
Net |  |
Total other intangible assets, Net | $ 444 | $ 437
Weighted Average Useful Life (years) | 17 years | 17 years
Patents |  |
Gross |  |
Finite-lived intangible assets, Gross | $ 33 |
Accumulated Amortization | (2) |
Net |  |
Finite-Lived Intangible Assets, Net, Total | $ 31 |
Weighted Average Useful Life (years) | 12 years |
Customer relationships |  |
Gross |  |
Finite-lived intangible assets, Gross | $ 356 | $ 333
Accumulated Amortization | (115) | (93)
Net |  |
Finite-Lived Intangible Assets, Net, Total | $ 241 | $ 240
Weighted Average Useful Life (years) | 20 years | 20 years
Technology |  |
Gross |  |
Finite-lived intangible assets, Gross | $ 103 | $ 103
Accumulated Amortization | (101) | (91)
Net |  |
Finite-Lived Intangible Assets, Net, Total | $ 2 | $ 12
Weighted Average Useful Life (years) | 9 years | 9 years
Other intangible asset |  |
Gross |  |
Finite-lived intangible assets, Gross | $ 38 | $ 20
Accumulated Amortization | (11) | (13)
Net |  |
Finite-Lived Intangible Assets, Net, Total | $ 27 | $ 7
Weighted Average Useful Life (years) | 19 years | 15 years
Trademarks/tradenames |  |
Gross |  |
Indefinite-lived intangible assets | $ 143 | $ 178
Net |  |
Indefinite-lived intangible assets, Net | $ 143 | $ 178

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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