Income Taxes - Narrative (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]
Statutory rate of income taxes	21.00%	21.00%	21.00%	21.00%
Income tax expense (benefit)	$ (30)	$ 34	$ (63)	$ 171
Operating loss carryforwards subject to SRLY tax rules will expire unutilized at December 31, 2020	$ 23		$ 23