Income Taxes - Components of the net operating loss carryforwards (Details) $ in Millions	Dec. 31, 2020 USD ($)
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 112
20-Year Carryforward Expires in 2025-2037
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	36
Indefinite Carryforward Period
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	76
US Federal
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	44
US Federal | 20-Year Carryforward Expires in 2025-2037
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	36
US Federal | Indefinite Carryforward Period
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	8
Foreign
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	68
Foreign | 20-Year Carryforward Expires in 2025-2037
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	0
Foreign | Indefinite Carryforward Period
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 68