Income Taxes - Reconciliation of the (Benefit) Provision for Income Taxes (Parenthetical) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes [Line Items]
Local income tax on intercompany transactions	$ 1	$ 7	$ 10
Australia Tax | Intangible Property Rights
Income Taxes [Line Items]
Local income tax on intercompany transactions			$ 10
COVID-19 Pandemic
Income Taxes [Line Items]
Income tax expense (benefit) due to CARES Act	$ (23)