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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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- 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.

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