Income Taxes (Details 5) - Continuing Operations [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Examination [Line Items]
Accrued interest and penalties	$ 12	$ 14
Total interest and penalties recorded during the period	2	(5)	$ 4
Unrecognized tax benefits reconciliation [Roll Forward]
Beginning of Year	100	91
Additions on tax positions related to the current year	19	3
Additions for tax positions of prior years	0	8
Reductions for tax positions of prior years	(5)	0
Reductions for settlements	0	(1)
Reductions due to statute expiration	(1)	(1)
Foreign currency translation adjustment	0	0
End of Year	$ 113	$ 100	$ 91