Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Contingency [Abstract]
Unrecognized benefit that would affect the effective tax rate	$ 1		$ 1
Amount of interest and penalties included in liabilities for uncertain tax positions	$ 1		$ 1
Effective tax rates	2.00%	29.50%	(1.20%)	31.50%
Income tax refund	$ 3	$ 9	$ 3	$ 9

Income Tax Contingency [Abstract]

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- Definition

Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

+ References

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-SubTopic 10
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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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- Definition

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.

+ References

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-Publisher FASB
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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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