Income Taxes Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Total Current Provision	$ 113	$ 162	$ 115
Total Deferred (Provision) Benefit	79	25	(381)
Provision for Income Taxes	$ (34)	$ (137)	$ (496)