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Summary of Significant Accounting Standards and Policies - Intangible assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Gross |  |
Total other intangible assets, Gross | $ 634 | $ 627
Accumulated Amortization | (197) | (167)
Net |  |
Total other intangible assets, Net | $ 437 | $ 460
Weighted Average Useful Life (years) | 17 years | 18 years
Customer relationships |  |
Gross |  |
Finite-lived intangible assets, Gross | $ 333 | $ 325
Accumulated Amortization | (93) | (77)
Net |  |
Finite-Lived Intangible Assets, Net, Total | $ 240 | $ 248
Weighted Average Useful Life (years) | 20 years | 20 years
Technology |  |
Gross |  |
Finite-lived intangible assets, Gross | $ 103 | $ 103
Accumulated Amortization | (91) | (80)
Net |  |
Finite-Lived Intangible Assets, Net, Total | $ 12 | $ 23
Weighted Average Useful Life (years) | 9 years | 9 years
Other intangible asset |  |
Gross |  |
Finite-lived intangible assets, Gross | $ 20 | $ 21
Accumulated Amortization | (13) | (10)
Net |  |
Finite-Lived Intangible Assets, Net, Total | $ 7 | $ 11
Weighted Average Useful Life (years) | 15 years | 16 years
Trademarks/tradenames |  |
Gross |  |
Indefinite-lived intangible assets | $ 178 | $ 178
Net |  |
Indefinite-lived intangible assets, Net | $ 178 | $ 178

X
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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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