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Short-term Borrowings and Other Debt Obligations Line Of Credit Facility (Tables)
12 Months Ended
Dec. 31, 2017
Line of Credit Facility [Line Items]  
Schedule of Line of Credit Facilities [Table Text Block]
(Dollars in millions)
December 31, 2017
Facilities
$
1,375

Less Uses of Facilities:
 
Letters of Credit
110

  Secured Term Loan Principal Borrowing
375

Borrowing Availability
$
890