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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
Income Taxes (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019	Mar. 31, 2018	Sep. 30, 2020	Sep. 30, 2019
Income Tax Examination [Line Items]
Effective income tax rate	49.60%	0.80%		40.10%	(350.60%)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			35.00%
Domestic Tax Authority [Member]
Income Tax Examination [Line Items]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$ 680			$ 680