Short And Long-Term Debt Loss on the Early Extinguishment of Debt and Write-Off of Financing Costs (Details) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	[2]	Jun. 30, 2018	Jun. 30, 2017
Debt Disclosure [Abstract]
Loss on the early extinguishment of debt	[1]	$ 0	$ 0		$ 7	$ 4
Write off of Deferred Debt Issuance Cost					$ 2

[1] Former parent legacy items and loss on the early extinguishment of debt are recorded in the Corporate and Other segment.

[2] Includes an $8 million expense related to the settlement of the Strader legal matter in Corporate and Other.