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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
Mar. 31, 2018
Mar. 31, 2017
Debt Disclosure [Abstract]    
Loss on the early extinguishment of debt [1] $ 7 $ 4
Write off of Deferred Debt Issuance Cost $ 2  
[1] Loss on the early extinguishment of debt is recorded in the Corporate and Other segment.