Income Taxes (Income tax (provisions) benefits attributable to income from continuing operations) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Deferred income taxes	$ 103	$ 50
Income tax provision	$ 103	$ 50
Effective Income Tax Rate Reconciliation, Percent	23.00%	22.00%

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration