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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
 [2]
Debt Disclosure [Abstract]        
Loss on the early extinguishment of debt [1] $ 0 $ 1 $ 7 $ 5
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.