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Credit Facilities (Tables) | 12 Months Ended
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Dec. 31, 2021
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).
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019 |  |
Average daily amount of short-term debt outstanding | $ | 139 |  |  | $ | 131 |  |  | $ | 7 |  |  |
Weighted daily average interest rate * | 0.9 | % |  | 1.5 | % |  | 2.6 | % |  |
Maximum amount outstanding during the year | $ | 230 |  |  | $ | 225 |  |  | $ | 46 |  |  |
* 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://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 + Details
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