Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income tax rate	23.20%	24.30%
Decrease in income tax percentage	0.034	0.006
Unrecognized tax benefits	$ 50	$ 50	$ 85
Unrecognized tax benefits that would impact the effective tax rate	43	43	59
Unrecognized tax benefits that would impact deferred taxes	7	7	$ 26
Possible decrease in unrecognized tax benefits	$ 20	$ 20

Effective Income Tax Rate Reconciliation, Increase (Decrease), Percent

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Unrecognized Tax Benefits that Would Impact Deferred Tax Rate

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Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit.

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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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Amount of unrecognized tax benefits.

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

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