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Summary of Significant Accounting Standards - Intangible assets (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Gross |  |
Total other intangible assets, Gross | $ 627 | $ 632
Accumulated Amortization | (167) | (139)
Net |  |
Total other intangible assets, Net | $ 460 | $ 493
Weighted Average Useful Life (years) | 18 years | 18 years
Customer relationships |  |
Gross |  |
Finite-lived intangible assets, Gross | $ 325 | $ 329
Accumulated Amortization | (77) | (62)
Net |  |
Finite-Lived Intangible Assets, Net, Total | $ 248 | $ 267
Weighted Average Useful Life (years) | 20 years | 20 years
Technology |  |
Gross |  |
Finite-lived intangible assets, Gross | $ 103 | $ 103
Accumulated Amortization | (80) | (68)
Net |  |
Finite-Lived Intangible Assets, Net, Total | $ 23 | $ 35
Weighted Average Useful Life (years) | 9 years | 9 years
Other intangible asset |  |
Gross |  |
Finite-lived intangible assets, Gross | $ 21 | $ 22
Accumulated Amortization | (10) | (9)
Net |  |
Finite-Lived Intangible Assets, Net, Total | $ 11 | $ 13
Weighted Average Useful Life (years) | 16 years | 16 years
Trademarks/tradenames |  |
Gross |  |
Indefinite-lived intangible assets | $ 178 | $ 178
Net |  |
Indefinite-lived intangible assets, Net | $ 178 | $ 178

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