The Separation and Basis of Presentation - Narrative (Details) $ / shares in Units, $ in Millions		3 Months Ended	9 Months Ended
	Apr. 01, 2020 USD ($) $ / shares shares	Mar. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Feb. 05, 2020	Jan. 02, 2020 USD ($)	Dec. 31, 2019 USD ($)	Feb. 08, 2019 company
Related Party Transaction [Line Items]
Number of publicly traded companies | company									2
Separation transaction, share conversion ratio						0.25
Payments for Separation Transaction	$ 728		$ 728
Separation transaction, shares issued to parent | shares	109,021,376
Common stock, par value (in dollars per share) | $ / shares	$ 0.01
Separation transaction, costs incurred			18
Receivables from customers				$ 876	$ 631		$ 281
Accounts payable, settlement arrangements								$ 1
ParentCo | Sale of customer receivables
Related Party Transaction [Line Items]
Transaction with related party, amount		$ 281
ParentCo
Related Party Transaction [Line Items]
Common stock, outstanding (in shares) | shares	436,085,504
Separation transaction, costs incurred			$ 38