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Long-Term Debt (Parenthetical) (Detail)
12 Months Ended
Dec. 31, 2016
Notes (USD)  
Debt Instrument [Line Items]  
Maturity date 2040
Notes (USD) | Minimum  
Debt Instrument [Line Items]  
Debt instrument, effective interest rate 0.881%
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 3.527%
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 1.808%
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 0.00%
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 0.636%