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Business combination - Purchase Price Allocation (Details) - USD ($) $ in Millions	Jul. 01, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Liabilities
Goodwill		$ 1,627	$ 1,455	$ 1,455
Vricon
Summary of fair value of consideration and preliminary estimated fair value of assets acquired and liabilities assumed
Call option purchase price	$ 117
Fair value of existing equity interest	117
Cash settlement of equity awards	26
Purchase consideration	260
Assets
Cash and cash equivalents	23
Trade and other receivables, net	9
Property, plant and equipment, net	3
Intangible assets, net	73
Other assets	7
Total Assets	115
Liabilities
Accounts payable	1
Accrued liabilities	3
Deferred income tax liability	17
Other current liabilities	6
Total Liabilities	27
Fair value of net identifiable assets acquired	88
Goodwill	$ 172