Income Taxes Unrecognized Benefits (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Unrecognized tax benefit — Permanent tax positions	$ 36,000,000	$ 35,000,000
Unrecognized tax benefit — Temporary tax positions	10,000,000	9,000,000
Total unrecognized tax benefit	46,000,000	44,000,000
NOL and tax credit carryforwards	42,000,000	40,000,000
Net Deferred Tax Liability associated with the Unrecognized Tax Benefit Amounts and Related NOLs and Tax Credit Carryforwards	(30,000,000)	(29,000,000)
Decrease in Unrecognized Tax Benefits is Reasonably Possible	28,000,000
Unrecognized Tax Benefits, Income Tax Penalties Accrued	$ 0	$ 0