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Basis of Presentation (Tables)
 9 Months Ended
Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Reconciliation of cash, cash equivalents and restricted cash The following table provides a reconciliation of Cash and cash equivalents and restricted cash reported in the Consolidated Balance Sheet to the total of the amounts in the Consolidated Statement of Cash Flows as of September 30, 2019 and December 31, 2018.
 
September 30, 2019
 
December 31, 2018
(Dollars in millions)
 
 
 
Cash and cash equivalents
$
853

 
$
921

Restricted cash included in Other current assets
8

 
6

Cash, cash equivalents and restricted cash in the statement of cash flows
$
861

 
$
927