Defined Contribution and Defined Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Contribution and Defined Benefit Plans [Abstract]
Defined Contribution Plan, Cost	$ 20	$ 20	$ 14
Employer Matching Contribution Percentage	100.00%
Deferral Election Percentage For Employer Matching Contribution	5.00%
Employee Deferral Limit Percentage	75.00%
Defined Benefit Pension Plan, Percent of Eligible Participants	4.00%
Assets for Plan Benefits, Defined Benefit Plan	$ 26	19
Liability, Defined Benefit Plan	33	27
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position	7	8
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	1	1	$ 1
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	6	4
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	4	$ 1
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	0
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	$ 1