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Short-Term Borrowings and Borrowing Arrangements (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Short-term Debt [Line Items] |  |
Short-term borrowings | $ 0 | $ 0
Ratio of debt to consolidated EBITDA | 1.3 |
Ratio of consolidated EBITDA to consolidated interest expense | 14.8 |
Credit Agreement [Member] | Revolving Credit Facility [Member] |  |
Short-term Debt [Line Items] |  |
Credit line available under the credit agreement | $ 3,000,000,000 |
Term of debt | 5 years |
Maximum borrowing capacity | $ 3,000,000,000 |
Credit Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member] |  |
Short-term Debt [Line Items] |  |
Ratio of debt to consolidated EBITDA | 3 |
Credit Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member] |  |
Short-term Debt [Line Items] |  |
Ratio of consolidated EBITDA to consolidated interest expense | 4 |
Credit Agreement [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |
Short-term Debt [Line Items] |  |
Interest rate for borrowing | 1.125% |

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- Definition Line of Credit Facility, Covenant Terms, EBITDA to Interest Expense Ratio + References No definition available. + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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