Long-Term Debt (Parenthetical) (Detail)		12 Months Ended
	May 09, 2016	Dec. 31, 2016
2.875% Notes Due 2016
Debt Instrument [Line Items]
Debt instrument interest rate		2.875%
Debt instrument maturity date		2016
1.375% Notes Due 2018
Debt Instrument [Line Items]
Debt instrument interest rate		1.375%
Debt instrument maturity date		2018
4.40% Notes Due 2021
Debt Instrument [Line Items]
Debt instrument interest rate		4.40%
Debt instrument maturity date		2021
3.000% Notes Due 2026
Debt Instrument [Line Items]
Debt instrument interest rate	3.00%	3.00%
Debt instrument maturity date	2026	2026
6.70% Notes Due 2026
Debt Instrument [Line Items]
Debt instrument interest rate		6.70%
Debt instrument maturity date		2026