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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 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)	9,000	31,000	766,000
Unrecognized compensation	$ 38				$ 38
Period for recognition (in years)					1 year 3 months 18 days
Restricted stock or unit expense	$ 7			$ 8	$ 22	$ 22
Restricted Stock \| Employee
Share-based Compensation Arrangement by Share-based Payment Award
Restricted shares granted to employees (in shares)					775,705
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