Long-term Debt and Debt Facility Agreements - Long-term Debt (Detail) In Millions, unless otherwise specified	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2012 Other variable rate debt [Member] USD ($)	Dec. 31, 2011 Other variable rate debt [Member] USD ($)	Dec. 31, 2012 2.75% Guaranteed Notes due 2015 [Member] USD ($)	Dec. 31, 2011 2.75% Guaranteed Notes due 2015 [Member] USD ($)	Dec. 31, 2010 2.75% Guaranteed Notes due 2015 [Member] EUR (€)	Dec. 31, 2012 4.50% Guaranteed Notes due 2014 [Member] USD ($)	Dec. 31, 2011 4.50% Guaranteed Notes due 2014 [Member] USD ($)	Mar. 31, 2009 4.50% Guaranteed Notes due 2014 [Member] EUR (€)	Dec. 31, 2011 5.25% Guaranteed Notes due 2013 [Member] USD ($)	Dec. 31, 2012 2.65% Senior Notes due 2016 [Member] USD ($)	Dec. 31, 2011 2.65% Senior Notes due 2016 [Member] USD ($)	Dec. 31, 2012 Floating Rate Senior Notes due 2014 [Member] USD ($)	Dec. 31, 2011 Floating Rate Senior Notes due 2014 [Member] USD ($)	Dec. 31, 2012 3.30% Senior Notes due 2021 [Member] USD ($)	Dec. 31, 2011 3.30% Senior Notes due 2021 [Member] USD ($)	Dec. 31, 2012 1.95% Senior Notes due 2016 [Member] USD ($)	Dec. 31, 2011 1.95% Senior Notes due 2016 [Member] USD ($)	Dec. 31, 2012 4.20% Senior Notes due 2021 [Member] USD ($)	Dec. 31, 2011 4.20% Senior Notes due 2021 [Member] USD ($)	Dec. 31, 2012 1.25% Senior Notes due 2017 [Member] USD ($)	Dec. 31, 2012 2.40% Senior Notes due 2022 [Member] USD ($)	Dec. 31, 2011 3.00% Guaranteed Notes Due 2013 [Member] USD ($)
Proforma Debt Instrument [Line Items]
Debt instrument maturity date	$ 9,509	$ 8,548	$ 277	$ 271	$ 1,318	$ 1,290	€ 1,000	$ 1,324	$ 1,297	€ 1,000	$ 649	$ 500	$ 498	$ 300	$ 300	$ 1,595	$ 1,595	$ 1,099	$ 1,099	$ 1,099	$ 1,099	$ 999	$ 998	$ 450
Fair value adjustment-hedging		8
Other Long-term Debt, Noncurrent, Total	$ 9,509	$ 8,556