Income Taxes Income Taxes - Provision for Income Taxes Charged To Income From Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Provision for Income Taxes [Line Items]
Current Federal Tax Expense (Benefit)	$ 0	$ 0	$ (2)
Current Income Tax Expense (Benefit)	8	34	0
Deferred Income Tax Expense (Benefit)	(10)	(1)	5
Income tax expense (benefit)	(3)	32	5
Deferred Foreign Income Tax Expense (Benefit)	(10)	(1)	5
Current State and Local Tax Expense (Benefit)	0	(3)	2
Current Foreign Tax Expense (Benefit)	$ 8	$ 37	$ (1)