Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income tax expense from continuing operations	$ 156	$ 119	$ 159	$ 140
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount				$ (200)