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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award
Compensation expense					$ 2
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award
Restricted shares granted to employees (in shares)	31,000	766,000
Unrecognized compensation	$ 45			$ 45
Period for recognition (in years)				2 years
Restricted stock or unit expense	$ 7		$ 7	$ 14	$ 14
Restricted Stock \| Employee
Share-based Compensation Arrangement by Share-based Payment Award
Restricted shares granted to employees (in shares)				766,205
Restricted Stock \| Employee \| Share-based Payment Arrangement, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting rights (in percentage)				50.00%
Award vesting period (in years)				2 years
Restricted Stock \| Employee \| Share-based Payment Arrangement, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting period (in years)				3 years
Restricted Stock \| Non-employee director
Share-based Compensation Arrangement by Share-based Payment Award
Restricted shares granted to employees (in shares)				30,674
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting period (in years)				3 years
Performance Shares \| Share-based Payment Arrangement, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting rights (in percentage)				33.00%
Performance Shares \| Share-based Payment Arrangement, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting rights (in percentage)				33.00%
Performance Shares \| Share-based Payment Arrangement, Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award
Award vesting rights (in percentage)				33.00%
2018 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares authorized (in shares)	7,000,000			7,000,000
Number of shares available for grant (in shares)	5,000,000			5,000,000