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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

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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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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
-Section 50
-Paragraph 2
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