Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 965	$ 964
Accumulated Amortization	(911)	(904)
Net Carrying Amount	54	60
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	957	957
Accumulated Amortization	(905)	(899)
Net Carrying Amount	52	58
Patents and licenses
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8	7
Accumulated Amortization	(6)	(5)
Net Carrying Amount	$ 2	$ 2