Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Finite-lived intangible assets
Finite-lived intangible assets, amortization expense	$ 10	$ 3
Expected amortization expense for the unamortized finite-lived intangible assets - remainder of 2020	31
Expected amortization expense for the unamortized finite-lived intangible assets - 2021	41
Expected amortization expense for the unamortized finite-lived intangible assets - 2022	4
Expected amortization expense for the unamortized finite-lived intangible assets - 2023	2
Expected amortization expense for the unamortized finite-lived intangible assets - 2024	$ 2