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Pension benefits - Funded Status of the Defined Benefit Plan (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jul. 01, 2018	Dec. 31, 2017
Retirement Benefits [Abstract]
Projected defined benefit obligations	$ (16)	$ (40)	$ (37)	$ (37)	$ (36)
Plan assets at market value	16	39	$ 33		$ 33
Funded defined benefit pension obligation	$ 0	$ (1)

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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