Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Income Tax Contingency [Abstract]
Unrecognized benefit that would affect the effective tax rate	$ 1
Amount of interest and penalties included in liabilities for uncertain tax positions	$ 1
Effective income tax rate	122.80%	(7.40%)
Federal [Member] \| Tax Year 2014 [Member]
Income Tax Contingency [Abstract]
Open tax year	2014
Federal [Member] \| Tax Year 2015 [Member]
Income Tax Contingency [Abstract]
Open tax year	2015
CARES Act [Member]
Income Tax Contingency [Abstract]
Discrete net tax benefit	$ 240
Maximum [Member]
Income Tax Contingency [Abstract]
Income tax refund	$ 2	$ 1

Income Tax Contingency [Abstract]

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Tax year that remains open to examination under enacted tax laws, in CCYY format.

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Amount of other income tax expense (benefit).

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The amount of cash received during the period as refunds for the overpayment of taxes.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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