Income Taxes Income Taxes - Provision for Income Taxes Charged To Income From Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Provision for Income Taxes [Line Items]
Current Federal Tax Expense (Benefit)	$ 0	$ (2)	$ (30)
Current Income Tax Expense (Benefit)	34	0	13
Deferred Income Tax Expense (Benefit)	(1)	5	31
Income tax expense (benefit)	32	5	44
Deferred Foreign Income Tax Expense (Benefit)	(1)	5	31
Current State and Local Tax Expense (Benefit)	(3)	2	2
Current Foreign Tax Expense (Benefit)	$ 37	$ (1)	$ 41