Income Taxes - Components of Income Tax (Benefit) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Tax Disclosure [Abstract]
Current	$ 7	$ 21	$ 44	$ 37
Deferred	(96)	(1)	(144)	(101)
Total Income Tax (Benefit) Expense	$ (89)	$ 20	$ (100)	$ (64)
Effective Tax Rate	18.70%	71.40%	2.20%	18.60%