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Credit Facilities (Tables) | 12 Months Ended
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Dec. 31, 2017
Line of Credit Facility [Abstract] |
Schedule of Short-term Debt [Table Text Block] | Short-term borrowings under these credit facilities and related interest rates are reflected in the following table (dollars in millions). The Company had no short-term borrowings during 2017.
| Years Ended December 31,
| 2017 |  | 2016 |  | 2015
Average daily amount of short-term debt outstanding | $ | — |  |  | $ | 1 |  |  | $ | — |
Weighted daily average interest rate * | — | % |  | 0.7 | % |  | 0.6 | %
Maximum amount outstanding during the year | $ | — |  |  | $ | 23 |  |  | $ | 11 |
* | Excludes the effect of commitment fees, facility fees and other financing fees.

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- Definition Tabular disclosure of short-term debt arrangements (having initial terms of repayment within one year or the normal operating cycle, if longer) including: (1) description of the short-term debt arrangement; (2) identification of the lender or type of lender; (3) repayment terms; (4) weighted average interest rate; (5) carrying amount of funds borrowed under the specified short-term debt arrangement as of the balance sheet date; (6) description of the refinancing of a short-term obligation when that obligation is excluded from current liabilities in the balance sheet; and (7) amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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