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Long-Term Debt (Parenthetical) (Detail)	12 Months Ended
	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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Debt Instrument Maturity Year

+ References

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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

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