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Long-Term Debt (Parenthetical) (Detail)
12 Months Ended
Dec. 31, 2015
Notes (USD)  
Debt Instrument [Line Items]  
Debt instrument, interest rate, weighted-average effective percentage rate range, minimum 0.37%
Debt instrument, interest rate, weighted-average effective percentage rate range, maximum 7.00%
Debt instrument, interest rate, weighted-average effective percentage rate range, average 4.75%
Maturity date 2040
Euro notes  
Debt Instrument [Line Items]  
Debt instrument, interest rate, weighted-average effective percentage rate range, minimum 1.08%
Debt instrument, interest rate, weighted-average effective percentage rate range, maximum 2.55%
Debt instrument, interest rate, weighted-average effective percentage rate range, average 1.97%
Maturity date 2035
Pound sterling notes  
Debt Instrument [Line Items]  
Debt instrument, interest rate, weighted-average effective percentage rate range, minimum 3.88%
Debt instrument, interest rate, weighted-average effective percentage rate range, maximum 7.25%
Debt instrument, interest rate, weighted-average effective percentage rate range, average 4.35%
Maturity date 2045
Swiss franc notes  
Debt Instrument [Line Items]  
Debt instrument, interest rate, weighted-average effective percentage rate range, minimum 0.00%
Debt instrument, interest rate, weighted-average effective percentage rate range, maximum 1.125%
Debt instrument, interest rate, weighted-average effective percentage rate range, average 0.73%
Maturity date 2025