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v3.8.0.1

Long-Term Debt (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2017
Notes (USD) |
Debt Instrument [Line Items] |
Maturity date | 2040
Notes (USD) | Minimum |
Debt Instrument [Line Items] |
Debt instrument, effective interest rate | 1.385%
Notes (USD) | Maximum |
Debt Instrument [Line Items] |
Debt instrument, effective interest rate | 7.00%
Notes (USD) | Weighted Average |
Debt Instrument [Line Items] |
Debt instrument, effective interest rate | 3.414%
Euro notes |
Debt Instrument [Line Items] |
Maturity date | 2035
Euro notes | Minimum |
Debt Instrument [Line Items] |
Debt instrument, effective interest rate | 1.00%
Euro notes | Maximum |
Debt Instrument [Line Items] |
Debt instrument, effective interest rate | 2.375%
Euro notes | Weighted Average |
Debt Instrument [Line Items] |
Debt instrument, effective interest rate | 1.93%
Pound sterling notes |
Debt Instrument [Line Items] |
Maturity date | 2045
Pound sterling notes | Minimum |
Debt Instrument [Line Items] |
Debt instrument, effective interest rate | 3.875%
Pound sterling notes | Maximum |
Debt Instrument [Line Items] |
Debt instrument, effective interest rate | 7.25%
Pound sterling notes | Weighted Average |
Debt Instrument [Line Items] |
Debt instrument, effective interest rate | 4.441%
Swiss franc notes |
Debt Instrument [Line Items] |
Maturity date | 2025
Swiss franc notes | Minimum |
Debt Instrument [Line Items] |
Debt instrument, effective interest rate | 0.05%
Swiss franc notes | Maximum |
Debt Instrument [Line Items] |
Debt instrument, effective interest rate | 1.125%
Swiss franc notes | Weighted Average |
Debt Instrument [Line Items] |
Debt instrument, effective interest rate | 0.627%

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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